This photo is the US Air Force ‘Thunderbirds’ Air
Demonstration Squadron in their famous 4-ship diamond formation. The
Navy team, the ‘Blue Angels’, claim that they fly closer
and tighter formations, but I don't see how any 4 jets could be in
a tighter and more square formation than these four ‘Fighting
Falcons’. If I recall correctly, this was the first year
that the Thunderbirds flew the F-16C, having been the last unit
in the USAF to convert out of the F-16A/B. These F-16's
can be converted back to combat ready aircraft in
72 hours, and the pilots are required to maintain their
combat readiness during their tour with the Thunderbirds.
This photo was taken at the Phoenix 500 air races, which were
held annually for 3 years in the early 1990's. The location is
the Williams Gateway Airport in Mesa, Arizona, which is the
former Williams Air Force Base.