A year later, Boeing switched from the 747X studies to pursue the Sonic Cruiser, and after the Sonic Cruiser program was put on hold, the 787 Dreamliner. Some of the ideas developed for the 747X were used on the 747-400ER, a longer range variant of the .
A year after abandoning the 747X studies, Boeing shifted its focus to the Sonic Cruiser program. When that program was put on hold, Boeing turned to the development of the 787 Dreamliner. Some concepts from the 747X were incorporated into the design of the 747-400ER, a longer range variant of the .