The Steam Summer Sale is ending soon! SimplePlanes is 75% off on Steam and SimpleRockets 2 is 35% off. Also, you can get an additional 15% off if you get the Aerospace Engineer bundle, even if you already own one of the games. This means that if you already have SimpleRockets 2 on Steam, then you can pick up SimplePlanes for less than $3 bucks.
Thanks for playing!