United Airlines Boeing 737-900ER N17403 taxiing at Chicago O'Hare International Airport with distinctive split scimitar winglets in the Evo Blue livery.

United Airlines Boeing 737-800 (N26226) prepares for departure at Denver International Airport under clear blue skies.

Taxiing in the early morning or golden hour, this Southwest Airlines Boeing 737-800 wears the vibrant 'Heart' livery with split scimitar winglets in front of a Frontier Airlines hangar.

SkyWest Airlines Bombardier CRJ-700 (N928EV) at the gate during early morning golden hour.

United Airlines Boeing 737-900ER awaits departure at gate A14, showing the modern globe livery and signature split scimitar winglets.

Delta Air Lines Airbus A321-211 (N375DN) taxiing on the ramp with iconic sharklet winglets in view.

United Airlines Boeing 737-800 (N34217) taxiing at the airport, viewed past distinctive split scimitar winglets.

United Airlines Boeing 737-800 (N27213) taxiing at San Francisco International, sporting the globe livery with blended winglets.

CAL FIRE Tanker 121 (Lockheed C-130 Hercules, N469DA) rests at base, ready for aerial firefighting missions.

United Airlines Boeing 737-800 (N77538) at the gate, ready for boarding at a major U.S. airport.

United Express Bombardier CRJ200 (N944SW) at the gate, readying for another regional flight.

A United Express Embraer 175 (N283SY) taxiing at the gate, wearing United's globe livery, a common sight in US regional operations.

United Express Embraer 175 (N138SY) at the gate, framed by airport operations at a busy terminal.

United Express Embraer 175 (N87380) at the gate in new globe livery, readying for another short-haul US domestic mission.

A United Airlines Boeing 737 MAX 8 (N27251) taxis at the terminal, with the aircraft's signature split scimitar winglets visible.

United Airlines Airbus A320-232 (N491UA) parked at a busy gate, sporting the airline's latest blue globe livery, with ground crew and vehicles preparing the aircraft for its next flight.

Breeze Airways Airbus A220-300 rotates off the runway in bright daylight, showing its modern blue livery and distinctive winglets.

United Airlines Boeing 737-800 (N27426) taxiing with split scimitar winglets at a major U.S. airport.

A United Airlines Boeing 737-900ER in the 2019 Evo Blue livery is seen taxiing at San Francisco International Airport, with a Dreamliner and other United jets in the background.

United Express Bombardier CRJ-700 (N780SK) taxiing at a major airport, wearing the latest Evo Blue livery.