First of all Congratulations on your new puppy!!! He is absolutely adorable
I can't believe the airline was so irresponsible...Poor little thing must have been scared to death! No answers or any sort of explanation? They have to have some sort of idea of what happened and they just didn't want to tell you...How terrible.
At least you were able to get your little one home to calm down a bit after that horrible plane ride and to the vet.
I will pray that he gets better soon and that he doesn't have any damage from the plane ride.