On 5 September 1967, ČSA Flight 523 crashed on climb-out from Gander International Airport, after being re-fuelled for the final leg of the flight. The aircraft took off from runway 14 climbing at an abnormally shallow angle. The aircraft struck a supporting wire of a mast, climbed to , then started to dive, hitting the ground at a speed of approximately , hit a railway embankment past the end of the runway, caught fire and broke into pieces. Four crewmen and 33 passengers were killed.
