American Airlines will soon let U.S. AAdvantage members combine cash and miles to pay for domestic flights, excluding routes to and from Alaska and Hawaii. The feature will roll out on the carrier’s website and mobile app in the coming weeks, with customers choosing their preferred mix through an interactive slider at checkout. American also launched a limited-time promotion offering eligible travelers with status from Delta SkyMiles, JetBlue TrueBlue and other programs an American Instant Status Pass valid for four months. The changes come as higher oil and jet-fuel costs push up airfares; Hopper says Thanksgiving round-trip prices are already 31% above last year and could reach a 10-year high this holiday season.