Atlanta-based 
Delta Air Lines is a major operator of the beloved Boeing 757. In fact, the carrier has the worlds largest aircraft fleet. While other airlines have retired the flying pencil over the years, Delta has remained committed, with no plans to eradicate the planes tenure. However, as some examples are over 30 years old, it could be argued that the end is in sight. Nonetheless, Delta is still flying several thousand passengers every week with the 757-200 and -300.