[Sangetsu]

First flight,

KAL
On-time, good food, friendly service (a flight attendant actually gave me her phone number when all I wanted was a pen).
In-flight internet service was a wonderful perk, and helped pass the long flight time.

Next three flights,
American,
All three flights not on time one was canceled altogether, and another flight was diverted to Osaka. I had to take the Shinkansen to Tokyo, and American never reimpursed me. Bags were put on the wrong plane, but still arrived in Tokyo ahead of me.

5th flight

JAL
On-time, good food, good service. The 747 "Jumbo" was old and didn't have video monitors, boarding and deplaning took forever.

6th flight

Continental

On-time, great service (first-class seats), my best experience so far. Within 20 mintues of landing at Narita, I had already cleared immigration, baggage claim, customs, and was sitting on the limousine bus headed to Tokyo Station.