1. The Tu-144 first flew on December 31, 1968, beating Concorde by several months. Despite its lead, the Tu-144 was not a success and a prototype catastrophically broke up in midair at
the Paris Air Show in 1970.
the London Air Show in 1971.
the Paris Air Show in 1971.

2. Concorde entered commercial service with British Airways and Air France in 1976. Although hailed as a technical success, less than __ were built because most airlines thought it was too limited in range and size.
20
14
17

3. The Concorde travels at ___________________, it routinely flies from London and Paris to New York and Washington in around three hours.
twice the speed of sound
the speed of sound
three times the speed of sound

4. Concordes still fly daily across the Atlantic at Mach 2.2, but an international development effort is projecting a replacement by ____, for the noisy and dangerous machine.
2000
2010
2020

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