If you're interested in a business travel card but don't fly enough to make United's elite — and expensive — United MileagePlus Club Card worth it, the United Explorer Business Card could be an ideal choice. The United Explorer Business Card has a lot to offer for business travelers who fly with United, but if you're looking for the best airline credit card for multiple carriers, you may want to compare it to another Chase business card, such as the Ink Business Preferred® Credit Card or the Ink Business Unlimited® Credit Card.