The closest scale for aircraft is 1/32 scale. You can easily mix the two scales with not just aircraft but 1/32 scale cars, trucks helos, etc. Check out this related thread for more on mixing 1/32 and 1/35 scales.
http://www.finescale.com/fsm/community/forum/topic.asp?TOPIC_ID=38201
Gino P. Quintiliani - Field Artillery - The KING of BATTLE!!!
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