The number of choices would be enormous. Fixing can be expensive, weekly problems are generally to big. The rotation problem is scheduling what individual planes will do. Look at individual airplane types and which particular plane to use. Different types of planes have the same capacity.
Planes are enormously expensive resources.
Fleeting used to be solved by local opt. When the researcher first approached this problem they conjectured that in a fleet of 500 airplanes they should be able to do fleeting with at least 1 or 2 fewer planes if problem was solved to optimality. However when minimizing the number of planes they came up with the same number as where being used. This was due to the fact that when the fleeting problem had been solved then if a plane was doing nothing a segment would be added. Airplane types are the commodies.