T-38 training jets. Photo courtesy of NASA.

Not many errant planes make it into Washington’s airspace. So if you see some jets flying low over the city tomorrow morning, fear not—it’s all part of a NASA training exercise.

According to the space agency, two T-38 training jets will fly 1,500 feet over Washington tomorrow between 9 and 11:30 a.m. to practice aerial photography. The training mission is being coordinated with the FAA, so there won’t be any scrambled jets from Andrews Air Force Base and impromptu Top Gun-style dog fights in the sky over our fair city tomorrow.

Some interesting info on the T-38, which was used by NASA to train astronauts for space flight:

Powered by two afterburning General Electric J85 engines, a T-38 can fly supersonic up to Mach 1.6 and soar above 40,000 feet, about 10,000 feet higher than airliners typically cruise. The plane can wrench its pilots through more than seven Gs, or seven times the force of gravity. That’s enough to make simply lifting hands a feat of strength and breathing a labored chore. It’ll make one’s neck feel like it is balancing a cinder block. It’s also more than enough to make the average person black out.

The flyover comes just two weeks before space shuttle Discovery will be flown over Washington on a 747 on its way to the Udvar-Hazy Center.