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

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

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

Taxiing in at LGA. Feels good to be home.

Plane spotting in the Delta Lounge.

N459UA parked at KDEN gate B25

A United Airlines Boeing 787-9 Dreamliner (N26910) climbs out with its signature raked wingtips and globe livery.

United Airlines Boeing 777-200 lifting off in the distinctive new 'evo-blue' livery.

Spotted on my way to the terminal.

Close-up slideshow of a United Airlines Boeing 787-800 (N26010) Dreamliner at the gate, showcasing the modern nose profile and Star Alliance logo.

A United Airlines Boeing 777-200 climbs out on departure in the airline's Evo Blue livery, illustrating the power and presence of this iconic long-haul twinjet.

United Airlines Boeing 787-8 Dreamliner N26910 rotates for departure, showcasing the elegant raked wingtips and modern Dreamliner lines.

A United Airlines Boeing 767-300 in overflies on approach.

United Airlines Boeing 737-800 (N47293) in Evo Blue livery at the gate, viewed from another aircraft.

A United Airlines Boeing 777-200 climbs out in the airline\'s modern blue livery against a clear sky.

United Airlines 777 sitting out on the ramp in Houston

A United Airlines Boeing 777 cruising overhead on a clear day, viewed from below through tree branches.

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

United Airlines Boeing 737-800 at the gate, with its iconic split scimitar winglets and the control tower in the background.

United Airlines Boeing 737-900ER taxiing at the airport under blue skies – a workhorse of the U.S. domestic fleet.