![](https://2c717466dc25cd7041c9-8eeda6a8ca964cf210ed223dbc947813.ssl.cf2.rackcdn.com/21416046-737954482-artboard-16_9-100x56.png)
When & Why Did United Airlines Retire The Boeing 747?
Summary United had an extensive fleet of Boeing 747s, operating 88 at different times. United found difficulty in maintaining the aircraft due to parts availability. US airlines followed United's lead in retiring the Boeing 747 due to fuel efficiency …