Print off a reference book. Its what I did.
Speed/climb charts organized by Country, type, and model, along with range/flight time at 0, 10, 20, and 30K (after climb-out on Mlitary power) for both 100% and 100 + DT if available, ordnance options, and WEP limits.
Added GV section, with armor layout, and a penetration table with more incriments than the AH one has, turret traverse rate, speed, rate of fire, and optical magnification.
Also included some reference pages like the typical radio channels used by some of the squads I flew around with, and some maps and a ruler so I could find the range to and from various places on the map for FSO and Scenarios.