Although i am not an expert in that category, i'll take a stab at it. im sure one of th experts ere will fill you in...
With any airline with more than one base, the aircraft are assainged to a base as per route demand, length, and other criteria. for example, (i dont know too much about LH
, so this is just an example) the routes out of MUC
may not be able to support 747 service. here in BOS
, we get daily LH
flights to MUC
is served by a 744 flight and an A330 flight, while MUC
is served by a single A343, because MUC
cannot support 744 service from BOS
. the demand is not high enough.
passenger demand i believe is one of the leading factors in the base assainment. as far as switching a base for an aircraft like the scenerio you mentioned, it would only happen if the ends justified the means. all 747 rated crew in FRA
would have to tranfer to MUC
Its a very complicated issue, but the basics are essentially:
distance vs. load factor, cargo, and fuel
effiecincy of the aircraft for that particular route
compatibiltiy of the aircraft with the airport
hope i got it in the ballpark!