I flew 12 hours in Singapore Airlines' first class. Here's what the experience is really like — and whether it's worth it.

One of the highlights of Singapore Airlines' first class was the comfortable lie-flat seat.David MorrisI spent nearly 12 hours flying first class on a Singapore Airlines flight from LA to Tokyo. The onboard service and food were excellent, and the comfortable seat made sleeping easy. At full price, the flight is hard to justify — but with points, it can be an exceptional value.First class is meant to remove friction from travel, from the moment you arrive at the airport to the moment you l