Continental is not new to Tokyo, while both IAH and EWR to NRT were both initated with the launch of the 777 Continental did fly SEA-NRT, they more recently had a 3 or 4x weekly HNL-NRT, which was pulled due to poor slot times at Narita, and they operate 17x weekly GUM-NRT with DC-10 and 737-800 equipment. In fact Continental serves more cities in Japan than any other US carrier. From Guam they serve Tokyo 17x weekly, Osaka daily, Sapporo 4x weekly, Niigata 2x weekly, Fukuoka 9x weekly, Sendai daily, Okayama 2x weekly, and Nagoya 2x daily.
Probably more info than you needed, but I was bored.
Stop drop and roll will not save you in hell. --- seen on a church marque in rural Virginia