Board Thread:General Discussion/@comment-26084187-20150304063557/@comment-50.184.105.249-20150304070544

I agree with EtherealSeraph, you should save up on Stock Fuel for Forced Sorties and/or Mercenary Contracts.

Also, you shouldn't spent too much credits on upgrades, parts, or aircraft you probably would not use often/ever. It will not make sense to just spend money on upgrading a MiG-21bis, where it could be better saved up for the more expensive ones, such as the FB-22 or the T-50 PAK FA.