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One of the signs describing the overall Milestones of Flight gallery. It reads

Milestones of Flight

These air and space craft are milestones in the history of flight. Each marks an important advance in technology or a historic event. They are a tribute to the imagination, skills, and dedication of all men and women who have made flight possible.

Breitling Orbiter 3 Gondola	1903 Wright Flyer	Bell X-1 Glamorous Glennis
		Ryan NYP Spirit of St. Louis
Mercury Friendship 7	Apollo 11 Command Module Columbia	Viking Mars Lander

Note that this sign apparently dates back to the time when the Wright Flyer was still displayed in Milestones of Flight (vaguely over Apollo 11). The plane has since been moved to its own gallery.