The short answer is no, but there are a few exceptions. The availability of blackjack depends on where you travel to and what site you are playing on. If you are traveling to Pennsylvania, where online casinos are legal, DraftKings and FanDuel Casino will carry over your available balance if you close the app and restart it to allow it to re-locate you. Other online casinos such as Stars Casino and SugarHouse will require you to make a separate Pennsylvania account. If traveling to a state like New York where online casinos are not yet legal, you will not be able to participate at all.