Constraints Cover constraints Each flight must be assigned to exactly one fleet Balance constraints Number of aircraft of a fleet type arriving at a station must equal the number of aircraft of that fleet type departing Aircraft count constraints Number of aircraft of a fleet type used cannot exceed the number available 2/212021 Barnhart 1.206J/16.77J/ESD. 15J2/21/2021 Barnhart 1.206J/16.77J/ESD.215J 11 Constraints • Cover Constraints – Each flight must be assigned to exactly one fleet • Balance Constraints – Number of aircraft of a fleet type arriving at a station must equal the number of aircraft of that fleet type departing • Aircraft Count Constraints – Number of aircraft of a fleet type used cannot exceed the number available