I have held the UA free card that gives 1 mile per $2 for quite awhile. I wanted the $60/ 15000 mile deal for a card that gives 1 mile per dollar spent, so I called customer service to see what I had to do. Was told that I first had to cancel my old card, then apply on line for the new one.
Perhaps I should have obtained a second opinion.
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The Personal Travel Experience of Gary Steiger - including how to get free frequent flyer miles on the web.