I nearly lost 24,500 AAdvantage miles on a rental car booking. Here’s how to avoid my mistake.

After TPG reader Jeanette Kronquist booked a flight from Nashville International Airport (BNA) to Seattle-Tacoma International Airport (SEA) via Dallas Fort Worth International Airport (DFW), the American Airlines website offered her rental car options. She clicked on the recommendations and was surprised she could pay for her four-day rental entirely with AAdvantage miles.  Scrolling through …