Clint Barton is a spry guy, but without a magical levitating hammer or jet thrusters, he's pretty much outclassed by his teammates. Comic artist Noelle Stevenson a.k.a. Ginger Haze (previously: 1, 2) has drawn up a delightful series of panels depicting the surly archer hitching a ride with Earth's Mightiest Heroes. I imagine there a lot of Mjölnir-paper-scissors contests to assign this privilege.
You can find more of Ginger's Avengers comics here. Loki is an Asgardian who enjoys his appletinis, apparently. Hat tip to Syafiqjabar of Mars!