Valley of the Dragons (1961)
Four stock shots of Rodan flying: one of Rodan peeking over a hill at 1:06:15, and three flying shots at 1:07:11, 1:07:27, and 1:07:40
The trailer is shown in this video.
By using it's main tag line, "They go a million years back in time..." and by using some of that film's main scenes.
features clips from the trailer of the film