NEW YORK (AP) - American Airlines is changing its frequent flier program, becoming the latest carrier to have passengers earn miles based on how much they spend rather than how far they fly.

NEW YORK (AP) American Airlines is changing its frequent flier program, becoming the latest carrier to have passengers earn miles based on how much they spend rather than how far they fly.

The move announced Tuesday follows similar changes by Delta Air Lines and United Airlines and benefits business travelers who purchase expensive, last-minute tickets.

The Fort Worth, Texas-based airline is also tweaking its reward chart, effective for trips booked after March 22. A domestic roundtrip award ticket remains 25,000 miles but flights from the U.S. to Canada and Alaska will go up to 30,000 miles roundtrip.

The biggest change domestically is the introduction of new 15,000 mile roundtrip awards for short flights of 500 miles or less.