Traveling and playing on your accounts is not a problem as I do it all the time. But if Blizzard sees that someone is logging into these accounts in a destination at the speed of light that could be interpreted as Account sharing. What does “at the speed of light” mean? It means that on Thursday in Washington the account was logged into at 130pm and also on Thursday the account was logged into at 430pm in Tennessee.
The only thing you can do is appeal this through the ticket system as nothing can be done on the forums.