AOG work at a hub of this size is constant: rotables, line spares and the certification documentation that makes them fittable, moving in both directions against an aircraft that is costing money every hour it is not flying.
The airport is also a transfer point, and where the operating airline, the airport and security rules permit it a handover can happen airside, removing a landside step entirely. Where they do not, we say so rather than implying a capability that depends on somebody else's permission.


