The Mosquito has the highest amount of Health and Power of the three aircraft. To offset that, the Mosquito is also the slowest in terms of Speed, and packs the least amount of punch in terms of Missile strength. Don't let that fool you though, the Mosquito is arguably the best plane in the game and makes the Padlocked achievement quite a bit easier to obtain.
Again, this achievement is probably the easiest in Single Player on the Peguin Difficulty. Although it can also be done online with a decent co-op partner. Keep in mind that unless you are hosting the match, you won't get this achievement.