United Airlines A320-232 (N475UA) in classic 1970s 'Friend Ship' retro livery being towed on a clear day.

Rolling through ORD.

Spotted on August 18, 2017 sitting at a gate in Terminal E

This special livery was applied to celebrate United's heritage and is much loved by both employees and aviation enthusiasts. The photo was likely taken at night with winter conditions visible on the ground.