Lufthansa became the launch customer on February 19 , 1965 , with an order for 21 aircraft , worth $ 67 million ( 1965 , $ 190.28 million in 2008 ) , after the airline received assurances from Boeing that the 737 project would not be canceled .
They ordered 21 aircraft , worth $ 67 million ( 1965 , $ 190.28 million in 2008 ) .