De Havilland DH.105 Comet 1
The first commercial jet airliner to enter service, developed by De Havilland. It was a pioneering aircraft but suffered from metal fatigue issues in early models.
De Havilland DH.106 Comet
The first commercially successful jet airliner, developed by De Havilland in the 1950s. It played a significant role in the development of commercial aviation, although early models suffered from metal fatigue issues.