In October 2005, JetBlue's quarterly profit had plunged from US$8.1 million to $2.7 million largely due to rising fuel costs. Operational issues, fuel prices, and low fares, JetBlue's hallmark, were bringing its financial performance down. In addition, with higher costs related to the airline's numerous amenities, JetBlue was becoming less competitive.[citation needed]

On December 13, 2007, jetBlue and Germany-based Lufthansa announced jetBlue's intent to sell 19% of jetBlue to Lufthansa, pending approval from US regulators. Following the acquisition, Lufthansa stated they plan to seek operational cooperation with jetBlue.[30] Lufthansa plans to offer connections to JetBlue flights in Boston, New York (JFK), and Orlando International Airport (no longer a connection).[31]


In 2008, jetBlue partnered with Irish flagship carrier Aer Lingus to allow passengers to switch between airlines on a single ticket for flights with connections in New York–JFK or Boston Logan. Unlike traditional codeshare agreements, the companies cannot sell seats on each other's flights, so customers initiate the purchase on one airline's website and then are transferred to the other site to complete the transaction.[105][106]
The initial JetExpress partnership with Mesa ended in January 2004, when Horizon Air was selected to operate the routes. Horizon utilized slightly larger CRJ-700 regional jet aircraft on these routes. In August 2006, Frontier and Horizon ended their partnership.[64] While Frontier was generally pleased with Horizon's operation, the carrier decided that it needed to revisit the agreement and find a provider with additional regional jets to grow the operation. The last of the CRJ-700's was returned to the Horizon Air fleet on November 30, 2007.
Advanced Air Air Choice One Air Flamenco Air Sunshine Bering Air Boutique Air Everts Air Frontier Flying Service Gem Air Grand Canyon Airlines Grand Canyon Scenic Airlines Grant Aviation Griffing Flying Service Hageland Aviation Services Island Airways JetSuiteX Kenmore Air Key Lime Air Makani Kai Air Mokulele Airlines New England Airlines Penobscot Island Air Reliant Air Rectrix Aviation San Juan Airlines Scenic Airlines Seaborne Airlines Servant Air Southern Airways Express Star Marianas Air Surf Air Taquan Air Tradewind Aviation Tropic Ocean Airways Ultimate Air Shuttle Utah Airways Vieques Air Link Warbelow's Air Ventures Wright Air Service
In July 2007, the airline partnered with 20th Century Fox's film The Simpsons Movie to become the "Official Airline of Springfield".[26] In addition a contest was held in which the grand prize would be a trip on JetBlue to Los Angeles to attend the premiere of the film. The airline's website was also redecorated with characters and their favorite jetBlue destinations and the company was taken over by the show/film's businessman villain Montgomery Burns.[27]
Denver to Las Vegas Detroit to Denver Chicago to Denver Seattle to Denver Denver to New York Denver to Chicago Atlanta to Denver Dallas to Denver Denver to Phoenix Denver to Los Angeles Houston to Denver Denver to Orlando New York to Denver Denver to Atlanta Phoenix to Denver Denver to San Diego Orlando to Denver Tampa to Denver Denver to San Francisco Denver to Seattle
Frontier Miles is the frequent-flyer program for Frontier Airlines, replacing the EarlyReturns program, which existed from 2003 to 2018.[70] Frontier Miles can be earned by flying Frontier Airlines, using the Frontier Airlines World MasterCard, or by spending at partner hotels, car rental chains, cruises, and merchants.[71] Frontier Miles can be redeemed for flights, magazine subscriptions, and car rentals.[72] Since February 2019, hotel stays are also part of the redemption options.[73]
In late 2009 Republic began to consolidate administrative positions and moved 140 jobs from the Frontier Airlines Denver headquarters to Indianapolis, Indiana.[29] Shortly after that, in January 2010, Republic Airways announced that it would move all of its executives to Indianapolis.[30] In February the Denver Business Journal stated that the headquarters would be moved "soon".[31] Despite this, according to the Denver Business Journal, Frontier Airlines will still maintain a local headquarters in Denver to house Training, Marketing, Customer Reservations, and Scheduling & Planning teams after extending its lease on the building through 2020.[citation needed]
On September 9, 2014, Frontier introduced an updated livery,[86] as part of a rebranding that saw the spokesanimals' roles increase. The new livery reintroduced a green "FRONTIER" typeface to the fuselage, featuring the stylized "F" designed by Saul Bass for the original Frontier in 1978. Each aircraft features the name of the animal featured on its tail near the nose of the aircraft for easier identification. Currently about twenty five aircraft in the Frontier fleet feature the new livery. 

ABX Air Air Cargo Carriers Air Transport International AirNet Express Alaska Central Express Aloha Air Cargo Alpine Air Express Ameriflight Amerijet International Ameristar Jet Charter Asia Pacific Airlines Atlas Air Baron Aviation Services Bemidji Airlines Castle Aviation Corporate Air CSA Air Empire Airlines Everts Air Cargo Express One International FedEx Express Flight Express Freight Runners Express Kalitta Air Kalitta Charters II Lynden Air Cargo Martinaire Merlin Airways Mid-Atlantic Freight Mountain Air Cargo National Airlines Northern Air Cargo Polar Air Cargo Royal Air Freight Ryan Air Services Sky Lease Cargo Southern Air Tepper Aviation Transair UPS Airlines USA Jet Airlines West Air Western Global Airlines Wiggins Airways
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