If anyone sees this in the future I struggled massively with Bad Altitude. I tried using Iron Man, Thor and Captain America (Sam Wilson) with the latter being good but it wasn't until I used Doctor Strange that I was able to finish the race with a few seconds to spare. The Helicopter was hard to steer in my opinion, but others may find success using someone else. I just felt Doctor Strange didn't veer off too much and was easy to maneuver.