Yeah, maybe. A couple more than that, I think? Iron Man 1 had a bunch of robot suits, I think? Or was that IM2? Guardians of the Galaxy had waves of invaders coming from the sky. I can't really remember them all, but it's a noticeable chunk.
Okay after a quick review it does look like there is a lot of flying action so I can see where the impression of invaders from the sky would come from.
1 Iron Man (2008) - Boss Fight v Ironmonger
2 The Incredible Hulk (2008) - Boss fight v Abomination (
Banner does fall from the sky)
3
Iron Man 2 (2010) - Armoured Drones attack from the Sky
4 Thor (2011) - Boss fight v Destroyer Armour
5 Captain America: The First Avenger (2011) - Boss Fight v Red Skull (
Plane Crashes in Arctic)
6
Marvel's The Avengers (2012) - Aliens attack from the Sky
7
Iron Man 3 (2013) - Iron Man suits attack from the sky
8
Thor: The Dark World (2013) - Elf Ships attack from Portals in the Sky
9 Captain America: The Winter Soldier (2014) - Boss Fight v Winter Soldier while
Helicarriers fall from the sky
10 Guardians of the Galaxy (2014)- Boss Fight v Ronan
11
Avengers: Age of Ultron (2015) - lots of robots attack from the sky
12 Ant-Man (2015) - Boss Fight v Yellow Jacket
13 Captain America: Civil War (2016) - Boss Fight + Heroes fight
including flyers in the sky)
14 Doctor Strange (2016) - Boss Fight
15 Guardians of the Galaxy Vol. 2 (2017) - Boss Fight v Dad
16 Spider-Man: Homecoming (2017) - Boss fight v Vulture (
flying)
17 Thor: Ragnarok (2017) - Boss fight v Hela