See the evolution of Boeing's design of the F-47, a sixth-generation stealth fighter jet, compared with competing NGAD concepts from Lockheed and others.

One flight crew examined their two-engine medium bomber with particular interest. The airmen must have wondered how this plane—marked with serial number 41-31773, but better known by the ...

Several passengers on board Flight 1533 said the security concern was a bomb threat written in one of the plane's lavatories, but authorities did not immediately confirm the nature of the threat.