I have two minor suggestions which would make it more convenient for us doing statistics:
1. In addition to the fleet management function (which I use primarily for sorting aircraft based on which hubs they operate out of), perhaps it would be a nice idea to be able to do a fleet breakdown based on aircraft type (i.e. add hyperlinks in the 'aircraft summary' table below so that the game can display the fleet according to aircraft type). This would enable us to compare aircraft age and aircraft DOC within a single subfleet, among other things, i.e. would work in the same way as the fleet management function.

(Yes, I know that when we opt to view all aircraft in our fleet we have the option to arrange them according to type, but this does not conveniently enable us to view a single type, nor does it permit us to compare aircraft DOC for a single type easily).
2. In addition to the 'aircraft ranking' function, which presently allows us to view the number of aircraft in the world according to aircraft type (as well as the airlines which operate a particular aircraft type, ranked according to the subfleet size), it would be useful if there is a function that allows us to rank airlines according to the total fleet size. I believe this is easily doable.
W506 - Ivy League Airways - Your Choice for Academic Travel
W737 - Delta Air Lines - One Great Airline, Together in Style
W1162 - Southwest Airlines - A Symbol of Freedom
W1481 - United Airlines - It's Time to Fly