During the Cuban Airlift thousands of refugees left Cuba for the U.S. 

From December 1965 to early 1973, under the Johnson and Nixon administrations,
twice daily "Freedom Flights" transported from Varadero Beach to Miami. The
longest airlift of political refugees, it transported 265,297 Cubans to the United
States with the help of religious and volunteer agencies. Flights were limited to immediate relatives and Cubans already in the United States with a waiting
period anywhere from one to two years.

This photo was first published on 12/2/1965 showing the arrival of 
Cuban refugees in Miami.

MIKE GRACIA

The Hughes H-4 Hercules is the largest flying boat ever built and has the largest wingspan of any aircraft in history. It remains in good condition and is on display
at the Evergreen Aviation & Space Museum in McMinnville, Oregon (below).
 

CARLATA BRADLEY

NANCY LYONS

N591UA taxiing on September 8, 2001, three days before the plane
was hijacked.

United Airlines Flight 93 was a domestic scheduled passenger flight hijacked by
four Al-Qaeda terrorists as part of the September 11 attacks. It crashed into a
field near Indian Lake in Shanksville,Pennsylvania during an attempt by the
passengers and crew to regain control, killing all 44 people aboard including
the four hijackers. No one on the ground was injured. The aircraft involved, a
Boeing 757–222 (shown above), was flying United Airlines‘ daily scheduled
morning flight from Newark International Airport in New Jersey to San Francisco
International Airport in California.

U.S. Vice President Joe Biden (right) visits the site where Flight 93 crashed, following a ceremony at the Flight 93 National Memorial in Shanksville, Pa., Sept. 11, 2012.