Chicago-based Jet Support Services Inc. has signed an agreement with Bombardier Aerospace in which the airframe manufacturer will provide the enrollment fee for JSSI’s top-of-the-line, tip-to-tail, customized hourly cost maintenance program applied to used “narrowbody” aircraft (primarily Learjets) taken in trade and sold over the next year. The paid-for fee will enroll a customer into the standard five-year JSSI contract, which is transferable upon sale of the aircraft.