[SkyPilot]

Their classification is now TR-1.

Actually, no. The aircraft is still called the U-2 in the Air Force inventory, as all TR-1s were redesignated U-2R's back in 1992. Here is a link to the official Air Force Website that lists it as the U-2.

_{SOUTHWEST ASIA -- Capt. Jeffrey Wright exits a U-2 Dragon Lady after a flight Feb. 5. The U-2 is a high-altitude, multi-intelligence reconnaissance aircraft that can fly above 70,000 feet. The jet provides near-real-time imagery and signals intelligence to warfighters and national authorities. Captain Wright is a U-2 pilot with the 99th Expeditionary Reconnaissance Squadron and is deployed from Beale Air Force Base, Calif. (U.S. Air Force photo by Airman 1st Class Brandi Branch)}

[RayChuang88]

Actually, the U-2 fleet underwent a major upgrade in the last few years where the original engines were replaced by a modified version of the non-afterburning General Electric F118 engine, the same engine used on the B-2 Spirit bomber.

But the plane is very tricky to fly--you take off and land on very narrow-track bicycle landing gears. One wrong move and disaster results, to say the least.