Could Captain America fly?

Yes, Captain America can fly, but not in the traditional sense like Iron Man or Thor. While he doesn't have the ability to fly unaided, there are several circumstances in the Marvel Universe where Captain America is able to "fly" or hover:

1. Using the Shield as a Boomerang

Captain America’s iconic vibranium shield is not only a defensive tool but also an offensive one. While Cap can't fly on his own, he has used the shield in creative ways to achieve temporary flight or hovering. By throwing the shield at an angle, it can ricochet and, in some cases, propel him upward or give him some lift.

However, this isn't true "flight," as it only works in specific situations and relies heavily on momentum and trajectory.

2. In the "Avengers: Endgame" Movie

In Avengers: Endgame (2019), Captain America does not gain the ability to fly like Iron Man or Thor. However, in one famous scene, he uses Thor's hammer, Mjölnir, to fight Thanos. When wielding Mjölnir, Cap is seen summoning lightning and using the hammer in a way that, while not exactly flying, gives him an enhanced sense of mobility and speed. But this is a result of wielding Mjölnir rather than his own ability to fly.

3. Using Vehicles (Flying Machines)

In some comic book storylines and movies, Captain America has used various flying machines, often provided by S.H.I.E.L.D. or Tony Stark. For example, in the Avengers movies, Cap has been seen riding in Quinjets and other aircrafts, but these aren't his personal abilities. However, he is often depicted as a skilled pilot.

4. Super Soldier Serum Enhancements

While Captain America doesn't have wings or jet boots, his enhanced physical abilities, thanks to the Super Soldier Serum, make him much more agile and capable of feats that could look like "flight." For example, he can leap very long distances and perform acrobatics that might seem similar to flight. This is more a testament to his strength and agility than true flying.

5. The "Captain America" Comics and Other Stories

In some alternate universes or what-if scenarios, Captain America has been shown to have the ability to fly, often by using advanced technology or becoming part of a larger storyline where he has access to equipment that allows him to soar. For example:

• In What If...? comics, some versions of Captain America have been depicted with different abilities, sometimes including flying or enhanced mobility.
• In Marvel's "Ultimate" Universe (Earth-1610), Captain America sometimes uses advanced technology to fly or participate in high-speed aerial combat.

6. Captain America and Falcon (Sam Wilson)

In the comics, Sam Wilson, the Falcon, eventually takes up the mantle of Captain America. Sam Wilson, as the Falcon, is capable of flight thanks to his mechanical wings. So, in a storyline where Sam Wilson becomes Captain America, he does have the ability to fly, but this is through technology (the wings) rather than Cap’s own inherent powers.

Conclusion:

While Captain America does not have the innate ability to fly like Iron Man or Thor, he has been depicted as achieving flight in certain circumstances. Whether it's using Mjölnir for enhanced mobility, jumping great distances, or utilizing advanced technology like Quinjets, Cap can "fly" in specific contexts. But, fundamentally, Captain America's superpower is his enhanced physical abilities — strength, agility, endurance, and intelligence — which allow him to do remarkable feats, even without the ability to fly unaided.