I flew business class with Qantas Airlines, American Airlines, and Singapore Airlines. Here's the best one and how the seats, food, service compare.

I accumulated enough Qantas points for business-class seats on one of the world's longest flights. My wife and I agreed our 17-hour trip from Dallas to Melbourne felt luxurious, not exhausting.

I flew business class with Qantas Airlines, American Airlines, and Singapore Airlines. Here's the best one and how the seats, food, service compare.