In short, the Douglas DC-7 is considered the last major piston-engine, propeller-driven airliner in the US, with surviving ...

The aviation museum in Tucson has a huge display of planes, including the oldest serving B-52, a SOFIA jetliner and a Martin JRM Mars flying boat.

• When: 9 a.m. to 5 p.m. daily for museum; 9 a.m. to 4 p.m. daily for restaurant. BY THE NUMBERS Pima Air and Space Museum's visitor count grew from 138,226 in 2005 to a peak in 2008 of 156,358.