Board Thread:General Discussion/@comment-26084187-20150304063557/@comment-25045164-20150304085835

You're talking about having a highly boosted F-15E in the other thread. So, may I assume that you're okay with your fighter and performance in online missions? If that's the case, how far are you in the research tree? Unlock the important Parts like Roll+, Pitch+, and Homing+ if you haven't. These are for you so you can hit aerial enemy more easily. The point here is that you want to have a good performance in missions which would reward you a lot of credits.

If you want though, you can stop researching. You can get credit reimbursement from every online mission as long as you're not researching anything. That's also a big additional load of cash you can get. By completing 1 mission, you can get reward of completing 2. I've done this once when I've unlocked all Parts in the tree and it returned a richly rewarding result.

Also, aside from the advices given above me, my personal advice is that you should cap your aircraft level. Stop at certain level. I did it at level 7 max; that's where all special weapons are unlocked. Anything beyond that level is just too expensive for too little boost IMO. You're better off unlocking Parts that I've mentioned and sharpening and relying on your skills. If you already have an aircraft past level 7, stop it at its level. As for bombers though, with appropriate Parts you can get MVP even at level 1. So, don't level up bombers whatsoever. Actually, that goes without saying. Seeing the upgrade cost alone is enough of a deterrence.