Same question - If I have a United Mileage Plus card and pay the taxes for 3 award tickets with a different credit card, will I still get a free checked bag per person? Or do I have to use the United card to pay the taxes? The website says I need to use the card, but I don't remember that being the case. Please let me know, would like to book tickets before Rosh Hashana, but don't have my United card on me.