Citation 500 Type Certification Marks 50 Years September marks the 50th year that the Citation 500 line of jets has been in operation since being granted FAA certification. On September 9th In 1971 the Federal Aviation Administration (FAA) granted certification for the Citation 500. Deliveries started in 1972 with one going to American Airlines for flight training purposes. Deliveries continued through to 1985 and by then 691 units were shipped. Of course direct descendants of the Citation 500 exist today with the 560XL better known as the Citation XLS+.