GAHHH, I sorta screwed myself by not picking all updates for the masquito, but meh...

Im on the mission with the dam, on the second part. I am swarmed by about 20+ me262's. (Which is very strange, for the 262 wasnt MADE in that year, plus, the Luftwafa never got more than 12 in the air at one time (fuel shortages))
I cant beat them, any craft I use, I am swamped, the Britteh doesnt help me, and I die.

Well now, lets see...have you gotten the challenge missions Recovery or Mosquito Bite? I know I had unlocked either the American XP-55 or XP-56. I think the mentioned challenges unlock them, but Recovery might be later in the game. These planes are able to go +450 mph when fully suped-up. I used wichever plane it was that is unlockable first, then upped its engines and airframe all the way and upped its armor by 2. Gave it extra gun and cannon ammo too.

Now that you have the suped-up plane ("Bullet" is its nick-name), you're ready to kick some Nazi arse. NEVER use the Mosquito for this mission! It's just not able to compete with the Me262. Right after the part where you destroy the generators with the "High-Ball" bomb, go to the Partisian airfield and arm your self with 37mm cannons. Take down any remaining Fw190s and get ready to really fight. When the Me262s arrive, pick one and stay with him. Use your "reflex time" to slow time down (it's like the Matrix!). Combine your guns with the cannons to anhilate your target. Repeat this to kill 'em all! The Me262s fly clockwise around an island, so fly counter-clockwise to attack them head-on. Remember to slow down time and fire BOTH guns AND cannons. You can always go back to the airfield to heal and re-arm.

Do this quickly and efficiantly or the ferries will escape!

P.S. There are worse enemies than the Me262...

oh yeah I hate when I have to fight the (warning spoilers for those to lazy to have finshed the game already)

quote highlight to see

rocket planes and the last level with the giant arse flying-hanger thingie that carries the small rocket planes.