Co-terminals refer to cities where an airline operates through multiple airports and allows crew members to begin and end their trips at different airports within the same metropolitan area.
Rather than assigning all crew operations to a single airport, airlines treat these airports as part of one operational base.
This system is especially common in large cities with several major airports, where airlines may need flexibility to match staffing with changing flight schedules and passenger demand.
Co-terminals allow airlines to optimize fleet utilization because certain aircraft types may operate from different airports within the same city. Depending on fleet assignments, pilots and cabin crew can switch airports during a trip if operational needs require it.