CHIEF JUSTICE TURNAGE
delivered the Opinion of the Court.
William J. Sebena, d/b/a Lewis and Clark Motel of Bozeman, Montana, appeals a judgment of the First Judicial District Court, Lewis and Clark County. That court rejected Sebena’s claim that the American Automobile Association (AAA) and AAA Montana intentionally interfered with the Lewis and Clark Motel’s prospective business advantage by delisting the motel from the AAA travel directory. We affirm.
The following issues are dispositive of this appeal:
1. Whether the District Court erred in denying Sebena a jury trial.
2. Whether the court erred in ruling that Sebena failed to prove damages.
AAA is a nonprofit Connecticut corporation which maintains its principal place of business in Heathrow, Florida. There are approximately 36,000,000 AAA members. AAA publishes regional TourBooks [307]*307which provide information for its members on attractions, lodging, and restaurants in various regions of the United States. AAA Montana, a nonprofit Montana corporation and a member club of AAA, maintains its principal place of business in Helena, Montana.
To be listed in a TourBook, an establishment must undergo an annual inspection and meet certain minimum standards. AAA ranks the motels listed in its TourBooks with one to five diamonds, in ascending order of quality.
Beginning in 1978, the Lewis and Clark Motel was listed in AAA’s annual TourBook for Montana, Idaho, and Wyoming. Until 1994, it was listed as a three- or four-diamond establishment. However, beginning in 1987, AAA’s annual inspectors noted deficiencies from AAA requirements in the Lewis and Clark Motel. Each year, Sebena was directed to correct these deficiencies to maintain the motel’s rating.
In March 1993, AAA advised Sebena that, based upon its most recent inspection, it would not list the Lewis and Clark Motel in its 1994 TourBook. Sebena subsequently brought this action, alleging that the defendants wrongfully and intentionally interfered with the motel’s business relationships with traveling members of AAA and with the motel’s expectancy of future economic benefit.
After a two-day nonjury trial, the court issued findings, conclusions, and judgment for the defendants. Sebena appeals.
ISSUE 1
Did the District Court err in denying Sebena a jury trial?
Sebena did not include a demand for jury trial in his complaint. He served his demand for jury trial as a separate document on June 16, 1994. The court granted the defendants’ motion to strike the demand for jury trial on the basis that the demand was untimely.
Rule 38(b), M.R.Civ.R, states:
Any party may demand a trial by jury ... by serving upon the other parties a demand therefor in writing at any time after the commencement of the action and not later than 10 days after the service of the last pleadingl] [Emphasis added.]
Sebena’s summons and complaint were served upon AAA on April 18, 1994. AAA and AAA Montana served a joint answer to the complaint on May 26. Thereafter, on May 31, AAA Montana was served with the summons and complaint.
The District Court ruled that Sebena’s June 16 demand for jury trial was untimely based upon its determination that the defendants’ [308]*308joint answer served on May 26 was the last pleading served for purposes of Rule 38(b). Sebena argues that the last pleading served was, instead, the copy of the complaint served upon AAA Montana on May 31, with return of service filed on June 2. He maintains that with three additional days for service by mail pursuant to Rule 6(e), M.R.Civ.R, and excluding weekends pursuant to Rule 6(a), M.R.Civ.R, his time for filing a demand for jury trial did not expire until June 21, 1994.
Citing Matter of Texas General Petroleum Corp. (5th Cir. 1995), 52 E3d 1330, Sebena concedes that in the “usual” case, service of the last pleading would be the service of the answer or a reply to a counterclaim. The pleadings in this action consist of the complaint and the answer. See Rule 7(a), M.R.Civ.R
The May 26 answer to Sebena’s complaint clearly stated that it was filed by “the Defendants, American Automobile Association and AAA Montana.” When this joint answer was filed, the District Court was vested with jurisdiction over both defendants, because “|j]urisdiction may be acquired by our courts over any person through service of process as herein provided; or by the voluntary appearance in an action by any person either personally, or through an attorney [.]” Rule 4B(2), M.R.Civ.P. Service of the complaint upon AAA Montana after AAA Montana had already filed its answer to the complaint was thus superfluous for jurisdictional purposes.
We conclude that when the joint answer was served on May 26, 1994, the last pleading had been served for purposes of Rule 38(b), M.R.Civ.P. Allowing three additional days for mailing and excluding weekends, a timely demand for jury trial should have been filed by June 10, 1994. See Detienne Associates v. Montana Rail Link (1993), 261 Mont. 238, 862 P.2d 1106.
Sebena’s counsel admits that he overlooked the fact that the May 26 answer was a joint answer by both defendants. He argues, however, that even if his demand for jury trial was late, the District Court abused its discretion in denying him a jury trial as allowed under Rule 39(b), M.R.Civ.P. Under that Rule, a court may order a jury trial notwithstanding the parties’ failure to timely demand one.
Because there is no Montana case on point, we look to cases decided under the corresponding federal rule of civil procedure, after which Rule 39(b), M.R.Civ.R, was patterned. The inadequacy of attorney oversight in failing to timely demand a jury trial as a reason for ordering a jury trial under Rule 39(b) has been clearly established in the federal courts.
[309]*309It is clear in the Ninth Circuit that a district court does not abuse its discretion in denying a request for a jury trial under Rule 39(b) when the only excuse for the failure to timely file a demand is oversight, inadvertence, neglect, or counsel’s unfamiliarity with federal practice and procedure. ... Indeed, Ninth Circuit authority suggests that the district judge may actually abuse his discretion by granting relief in these circumstances.
Robertson v. Equitable Life Assur. Soc. of U.S. (D.C. Cal. 1987), 661 F.Supp. 416, 424-25, aff’d, 869 F.2d 1498 (1989).
We hold that the District Court did not err in ruling that the time for demanding a jury trial pursuant to Rule 38(b), M.R.Civ.P, began to run upon the service of the defendants’ joint answer to Sebena’s complaint and expired before Sebena filed his demand for jury trial. We further hold that the District Court did not abuse its discretion by declining to order a jury trial under Rule 39(b), M.R.Civ.P.
ISSUE 2
Did the court err in ruling that Sebena failed to prove damages?
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CHIEF JUSTICE TURNAGE
delivered the Opinion of the Court.
William J. Sebena, d/b/a Lewis and Clark Motel of Bozeman, Montana, appeals a judgment of the First Judicial District Court, Lewis and Clark County. That court rejected Sebena’s claim that the American Automobile Association (AAA) and AAA Montana intentionally interfered with the Lewis and Clark Motel’s prospective business advantage by delisting the motel from the AAA travel directory. We affirm.
The following issues are dispositive of this appeal:
1. Whether the District Court erred in denying Sebena a jury trial.
2. Whether the court erred in ruling that Sebena failed to prove damages.
AAA is a nonprofit Connecticut corporation which maintains its principal place of business in Heathrow, Florida. There are approximately 36,000,000 AAA members. AAA publishes regional TourBooks [307]*307which provide information for its members on attractions, lodging, and restaurants in various regions of the United States. AAA Montana, a nonprofit Montana corporation and a member club of AAA, maintains its principal place of business in Helena, Montana.
To be listed in a TourBook, an establishment must undergo an annual inspection and meet certain minimum standards. AAA ranks the motels listed in its TourBooks with one to five diamonds, in ascending order of quality.
Beginning in 1978, the Lewis and Clark Motel was listed in AAA’s annual TourBook for Montana, Idaho, and Wyoming. Until 1994, it was listed as a three- or four-diamond establishment. However, beginning in 1987, AAA’s annual inspectors noted deficiencies from AAA requirements in the Lewis and Clark Motel. Each year, Sebena was directed to correct these deficiencies to maintain the motel’s rating.
In March 1993, AAA advised Sebena that, based upon its most recent inspection, it would not list the Lewis and Clark Motel in its 1994 TourBook. Sebena subsequently brought this action, alleging that the defendants wrongfully and intentionally interfered with the motel’s business relationships with traveling members of AAA and with the motel’s expectancy of future economic benefit.
After a two-day nonjury trial, the court issued findings, conclusions, and judgment for the defendants. Sebena appeals.
ISSUE 1
Did the District Court err in denying Sebena a jury trial?
Sebena did not include a demand for jury trial in his complaint. He served his demand for jury trial as a separate document on June 16, 1994. The court granted the defendants’ motion to strike the demand for jury trial on the basis that the demand was untimely.
Rule 38(b), M.R.Civ.R, states:
Any party may demand a trial by jury ... by serving upon the other parties a demand therefor in writing at any time after the commencement of the action and not later than 10 days after the service of the last pleadingl] [Emphasis added.]
Sebena’s summons and complaint were served upon AAA on April 18, 1994. AAA and AAA Montana served a joint answer to the complaint on May 26. Thereafter, on May 31, AAA Montana was served with the summons and complaint.
The District Court ruled that Sebena’s June 16 demand for jury trial was untimely based upon its determination that the defendants’ [308]*308joint answer served on May 26 was the last pleading served for purposes of Rule 38(b). Sebena argues that the last pleading served was, instead, the copy of the complaint served upon AAA Montana on May 31, with return of service filed on June 2. He maintains that with three additional days for service by mail pursuant to Rule 6(e), M.R.Civ.R, and excluding weekends pursuant to Rule 6(a), M.R.Civ.R, his time for filing a demand for jury trial did not expire until June 21, 1994.
Citing Matter of Texas General Petroleum Corp. (5th Cir. 1995), 52 E3d 1330, Sebena concedes that in the “usual” case, service of the last pleading would be the service of the answer or a reply to a counterclaim. The pleadings in this action consist of the complaint and the answer. See Rule 7(a), M.R.Civ.R
The May 26 answer to Sebena’s complaint clearly stated that it was filed by “the Defendants, American Automobile Association and AAA Montana.” When this joint answer was filed, the District Court was vested with jurisdiction over both defendants, because “|j]urisdiction may be acquired by our courts over any person through service of process as herein provided; or by the voluntary appearance in an action by any person either personally, or through an attorney [.]” Rule 4B(2), M.R.Civ.P. Service of the complaint upon AAA Montana after AAA Montana had already filed its answer to the complaint was thus superfluous for jurisdictional purposes.
We conclude that when the joint answer was served on May 26, 1994, the last pleading had been served for purposes of Rule 38(b), M.R.Civ.P. Allowing three additional days for mailing and excluding weekends, a timely demand for jury trial should have been filed by June 10, 1994. See Detienne Associates v. Montana Rail Link (1993), 261 Mont. 238, 862 P.2d 1106.
Sebena’s counsel admits that he overlooked the fact that the May 26 answer was a joint answer by both defendants. He argues, however, that even if his demand for jury trial was late, the District Court abused its discretion in denying him a jury trial as allowed under Rule 39(b), M.R.Civ.P. Under that Rule, a court may order a jury trial notwithstanding the parties’ failure to timely demand one.
Because there is no Montana case on point, we look to cases decided under the corresponding federal rule of civil procedure, after which Rule 39(b), M.R.Civ.R, was patterned. The inadequacy of attorney oversight in failing to timely demand a jury trial as a reason for ordering a jury trial under Rule 39(b) has been clearly established in the federal courts.
[309]*309It is clear in the Ninth Circuit that a district court does not abuse its discretion in denying a request for a jury trial under Rule 39(b) when the only excuse for the failure to timely file a demand is oversight, inadvertence, neglect, or counsel’s unfamiliarity with federal practice and procedure. ... Indeed, Ninth Circuit authority suggests that the district judge may actually abuse his discretion by granting relief in these circumstances.
Robertson v. Equitable Life Assur. Soc. of U.S. (D.C. Cal. 1987), 661 F.Supp. 416, 424-25, aff’d, 869 F.2d 1498 (1989).
We hold that the District Court did not err in ruling that the time for demanding a jury trial pursuant to Rule 38(b), M.R.Civ.P, began to run upon the service of the defendants’ joint answer to Sebena’s complaint and expired before Sebena filed his demand for jury trial. We further hold that the District Court did not abuse its discretion by declining to order a jury trial under Rule 39(b), M.R.Civ.P.
ISSUE 2
Did the court err in ruling that Sebena failed to prove damages?
To establish a case of intentional interference with prospective business advantage, a plaintiff must show acts which (1) were intentional and willful; (2) were calculated to cause damage to the plaintiff’s business; (3) were done with unlawful purpose of causing damage or loss, without right or justifiable cause on the part of the actor; and (4) resulted in actual damages or loss. State Med. Oxygen v. Amer. Med. Oxygen (1988), 230 Mont. 456, 462, 750 P.2d 1085, 1088-89. Damages must be proven by substantial evidence which is not the product of mere guess or speculation. Lenz Const. Co. v. Cameron (1984), 207 Mont. 506, 511, 674 P.2d 1101, 1103.
Sebena argued that the defendants’ failure to list his motel in the TourBook cost him guests and, therefore, money. His evidence of damages consisted of his statement that the motel had a loss of 1,065 room rentals between 1993, the last year the motel was listed in the TourBook, and 1994, the first year it was not listed. He multiplied that number by a nightly room rental rate of $48.36 to arrive at a figure of $51,503.40 for his 1994 revenue loss from delisting.
During cross-examination, Sebena and his daughter, the motel’s general manager, both admitted that they maintained no records showing the number of room rentals generated through AAA. Sebena’s daughter also admitted that additional motels built in Bozeman might have had an impact on the business of the Lewis and Clark Motel. Sebena’s accountant similarly testified that he did not have [310]*310any records on the percentage of the motel’s business attributable to the AAA listing. The accountant further attested on cross-examination that no significant capital improvements had been made to the Lewis and Clark Motel between 1989 and 1993.
In short, Sebena offered no concrete information on the percentage of his motel business which was attributable to the AAA listing. Nor did he offer expert testimony specifying the portion of loss of business, if any, which was attributable to delisting by AAA, or the portion of the claimed lost revenue representing lost profits.
This Court has set forth the following rules pertaining to the recovery of lost profits:
Damages for loss of profits may be awarded if not speculative. The rule that prohibits speculative profits does not apply to uncertainty as to the amount of such profits but to uncertainty or speculation as to whether the loss of profits is the result of the wrong and whether such profit would have been derived at all. Once liability is shown, that is the certainty that the damages are caused by the breach, then loss of profits on a reasonable basis for computation and the best evidence available under the circumstances will support a reasonably close estimate of the loss by a District Court. But no damages are recoverable which are not clearly ascertainable both in nature and origin, and only profits which are reasonably certain may be awarded.
Stensvad v. Miners & Merchants Bank, Etc. (1982), 196 Mont. 193, 206, 640 P.2d 1303, 1310 (citations omitted).
The District Court concluded that Sebena failed to show that he suffered any damages, based on the absence of records regarding the portion of the motel’s business related to AAA and the absence of analysis by the accountant of lost profits relating to the delisting. We agree with the conclusion of the District Court.
Sebena has also raised two other issues on appeal. One of them concerned the court’s refusal to admit into evidence guests’ comment cards about the motel, which he offered as evidence that delisting his motel was unjustified. The other issue Sebena raised was whether the court should have addressed a breach of contract claim which he asserted. Any claim for breach of contract, like the claim of intentional interference with prospective business advantage, would have required nonspeculative proof of damages. See Bolz v. Myers (1982), 200 Mont. 286, 300-01, 651 P.2d 606, 613-14. Given our holdings on the issues discussed above, we conclude that we need not further address these other two issues.
[311]*311Affirmed.
JUSTICES ERDMANN , NELSON and HUNT concur.