FAA Certification Late 2017 For Citation Longitude The Cessna Citation Longitude test program is going well. The program has amassed over 450 hours so far using four test aircraft. The latest Longitude test bed, the fourth article was on display at the recently concluded 2017 edition of the European Business Aviation Conference and Exhibition (EBACE). That aircraft was fitted with a full production interior. Most of the parameters of the program have been successfully done and a fifth and final aircraft is anticipated to join this Summer.