Spirit Airlines Airbus A320 (N632NK) in the blue/white livery touches down at a busy hub, showcasing a now-retired livery for turbine fans.

The Bluemanity livery was introduced as part of a campaign to highlight unity and social causes, making this aircraft a favorite among avgeeks and spotters.

This aircraft is nicknamed 'Blue Monster' and is a frequent sight at Boston Logan due to its sports livery partnership.

This livery and older color scheme for Spirit Airlines is seldom seen nowadays, as Spirit has moved entirely to its yellow branding.

This jetBlue A320, N580JB 'Mo' Better Blue', is configured for high-density operations within the US and Caribbean. The tail design is known as 'Blueberries', one of jetBlue's signature tailfins.

The aircraft bears the name 'Betty Blue' under the cockpit windows, which is common for jetBlue to personalize their fleet. The IAE V2527-A5 engines are a popular A320 engine choice.

The aircraft carries the name 'Enough About Blue... Let's Talk About Blue' as seen near the nose—aircraft names are a fun tradition within jetBlue's fleet.

This specific aircraft, N657JB, is named 'Denim Blue.' The photo also features another airliner in the background.

N653JB carries the individual aircraft name 'Breath of Fresh Blue' beneath the cockpit window. The Mosaic tail design is one of JetBlue's signature liveries.

Spirit's "Bare Fare" yellow livery is one of the most recognizable in North America and represents their ultra-low-cost business model.

CFM56 engines are the most common on Avianca’s A320ceos; this aircraft is often seen on routes between Colombia, Central America, and the U.S.