The 757 uses many of the same components as the widebody 767, and the two planes have a common FAA type-rating, enabling flight crews to earn certification for both by training and testing only on one.
The C-32, a variant of the 757, is the usual transportation for the Vice President of the United States.
A 757 is also serving as the Presidential Transport in Argentina, and 757s form part of the fleet used by the royal family of Saudi Arabia.
The 757 is sold in two versions, the 757-200, and the 757-300.
The 757 models share many features with the twin-aisle 767, which was developed concurrently with the 757-200.
Both 757 models as well as the 767 have a common type-rating, so pilots qualified to fly one of the aircraft also can fly the others with only minimal additional familiarization, saving training time and costs.