Hey,
Americamp is incredibly useful with support I've found, if I've ever got a problem I can either Facebook, Skype or Call them and get a response almost instantly.
Although Americamp don't get involved with the booking of flights you'll meet other Americampers at the orientation day they offer and can arrange with others to book flights together (You'll also most likely find a FB Group for your camp where people often try and book flights together)
Overall, it's not really a huge issue if you can't get on the same flights as others, I've flown in / out of America quite a few times on my own due to studying abroad & Americamp and never had any issues. (It's best to try and sleep on the plane anyway to counter jetlag imo)