It would be interesting to hear from the legal guys on this. I believe that trademarks may be limited to items that are very similiar and not widely different. For example, “Citation” is a Cessna brand for their business jets that didn’t stop Chevy from naming a car that. I think there are other products that use the name. Likewise, “Challenger” is the name of Bombardier’s (nee Canadair) business jet and also Dodge’s muscle car.