I don't think giving someone a free low-end plane to die in, over and over, will help player retention. That's not fun, and people have other gaming options.
FWIW, the only solution to your problem may be to learn to enjoy gameplay while outnumbered, and forget "winning the war" if your on the outnumbered side. If you just focus on your individual plane or GV, there are plenty of goals you can achieve. There always will be opportunities for a skilled player to pick away at the horde. And if you're not that skilled, then becoming so is an additional goal to achieve.