Being a Barclays Bank of Delaware Frontier Airlines World MasterCard holder has its perks. However with the pros, there are always the cons as well. Because the Barclays Frontier MasterCard is part of the international MasterCard network, you would be able to use this card where ever MasterCard is accepted (which, let's be honest, is pretty much everywhere). Unfortunately, I am not completely thrilled with the airline option available with this Bank of Delaware milage card. Frontier is great for those travelers on a budget who either live in Colorado or love to travel there. Being a budget airline, please be warned that Frontier Airlines charges for EVERYTHING, from beverages in-flight to carry on luggage. Available Rates The rate that I was offered when applying for the Barclays Bank of Delaware Frontier Airlines World MasterCard were on par with the average rates available today. While they were not impressive, they were not super high either. In fact, they are lower than the rate of my current airline milage MasterCard.