I'd like to see more trainers in 1/48 scale, injected molded. Airplanes like these:
Ryan PT-22, Vultee BT-13/15, AT-6D, Harvard Mk II, T-28A, Raytheon T-6 Texan II, Fairchild PT-19, Bedech AT-11, Beech T-34C.
Any or all of those from a maunfacturer like Tamiya or Airfix would be terrific.