My alliance I'd now losing a war to a team that has multiple players both Space Age and Cold War Age that have an added up total of 10 aircraft spaces used in the war. They are mowing over our best defenses like it's nothing. Is 10 spaces possible?
Video replays are really off, especially with planes, there is not a war that goes by where I don’t see 10, 12, 14, etc planes used and the wrong age... but it never hurts to report them, maybe they will get around to fixing the replays so they are accurate. Nexon has done a good job recently with cheaters using tt hacks, but there are still ways to cheat out there
You basically have to see 10 planes on the screen at the same time (in the replay) to know if they used that many for sure. Replay end results are often bogus and may show large numbers. I've never seen wrong age planes like this so can't speak to that; but it sounds bad.
Also, 9 planes the most possible (8, +1 for some temporary buildings). That doesn't include troop tactic cards (e.g., Recon, Zero, Vickers, etc.) but I suspect you aren't referencing those; although Recon isn't clearly a TT in the end screen but that's Digital so you'd know in this case.
Also check their alliance on dominations.pl -- maybe it'll lead to additional clues.
Extra planes appear because in the replay, the defense shoots down the plane, while in the original source battle, it does not. Video replays are lousy.