MR String model: Variable Definition A string is a sequence of flights beginning and ending at a maintenance station with maintenance following the last flight in the sequence Departure time of the string is the departure time of the first flight in the sequence Arrival time of the string is the arrival time of the last flight in the sequence maintenance time 2/212021 Barnhart 1.206J/16.77J/ESD. 15J2/21/2021 Barnhart 1.206J/16.77J/ESD.215J 5 MR String Model: Variable Definition • A string is a sequence of flights beginning and ending at a maintenance station with maintenance following the last flight in the sequence – Departure time of the string is the departure time of the first flight in the sequence – Arrival time of the string is the arrival time of the last flight in the sequence + maintenance time