I don’t agree with limiting the number of airborne. IMO, it’s a gratuitous rule. 1 airborne inf cost 3/4 IPCs, + 1 bomber cost of 12 IPCs = 16 IPCs for one airborne op! Italy would never use airborne. One of the great things about A&A is the WIF (What If Factor). If someone wants to foot the cost for a massive 10 inf airborne op (150/160 IPCs!), well God bless 'em. They deserve to take whatever territory they land in.
Also, IMO, the Paratrooper Tech for AA50 would have been better named as Gliders. Being able to both carry inf and bomb makes no sense unless the fully loaded bomber is also hauling a glider, which justifies the range limit.
Therefore, the “elite inf” piece, whatever nation specific power it gets, should also be the airborne unit, coat 4 (for the extra training) and each bomber carries 1, but cannot attack unless you have “gliders”.