After making a codeshare agreement with Lufthansa that went into effect in 2010, jetBlue transitioned to the Sabre reservation system used by Lufthansa,[107] enabling the airlines to sell tickets on each other's flights, transfer luggage and passengers between the two carriers, and combine frequent flyer programs,.[108] By making use of JetBlue's North America routes as a feeder network, the agreement put Lufthansa in a position to operate quasi-hubs in New York–JFK and Boston Logan.
jetBlue's first major advertising campaign incorporated phrases like "Unbelievable" and "We like you, too". Full-page newspaper advertisements boasted low fares, new aircraft, leather seats, spacious legroom, and a customer-service-oriented staff committed to "bringing humanity back to air travel".[92] With a goal of raising the bar for in-flight experience, jetBlue became the first airline to offer all passengers personalized in-flight entertainment. In April 2000, flat-screen monitors installed in every seatback allow customers live access to over 20 DirecTV channels at no additional cost.[93]
Frontier Airlines (F9) is a Denver-based low-cost carrier. The carrier flies to about 65 destinations in the United States, Costa Rica, the Dominican Republic, Jamaica and Mexico. Its fleet of planes each feature a single Economy Class cabin. However, passengers can upgrade to Select Seating, which is located toward the front of the plane, or Stretch Seating, which features more legroom. Frontier's hub is based at Denver International Airport (DEN). An additional eight airports have been designated as focus cities. The airline has a codeshare agreement with Great Lakes Airlines.

Frontier’s mobile app makes travelling easier than ever before! Wanna skip the lines? Use our mobile boarding pass and go straight to the security checkpoint. Need to add a bag or select your seat? This app makes it easy. Now you can add you bag or seat after you make your initial booking and even after checking in. On the go, but need to book a flight? Shop our low, low fares here. Want a stretch seat, a checked and/or a carry-on bag? THE WORKS makes them available at one low price which includes refundability and no change fees. Wanna’ know the status of your flight? Get up-to-the-minute flight information here.
Like Ryanair, the low-cost airline founded by the Ryan family of Ireland, who also have invested in Allegiant, the airline seeks ancillary revenue to supplement ticket revenue.[13] These ancillary fees include those for checking luggage, carrying on luggage (other than a small personal item), buying food and drinks on board, obtaining advance seat assignments, and more.[33][40][41] Allegiant CEO Maurice Gallagher said in 2009, "We collect $110 from you at the end of your trip. If I tried to charge you $110 up front, you wouldn't pay it. But if I sell you a $75 ticket and you self-select the rest, you will."[42]

In summer 2015, a rash of midair breakdowns drew federal scrutiny. "Before the night was finished on June 25, 2015, five Allegiant flights had been interrupted in four hours, all because different planes had failed in midair," reported the Tampa Bay Times.[28] Since October 2015, the Federal Aviation Administration has kept Allegiant under close supervision.[29][30][31] In July 2015, Allegiant Air announced bases would be established at the Asheville Regional Airport and Cincinnati/Northern Kentucky International Airport, becoming the first base at a non-vacation destination.[citation needed]
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]
Dave Siegel took the chief executive officer role in January 2012.[62] Siegel's tenure ran through May 2015, when he left for personal reasons and was succeeded by the company's chairman, Bill Franke, who would manage strategy and finances.[62] In April 2014, Barry L. Biffle was appointed as the company's president, reporting to Siegel;[63] after Siegel's departure, Biffle was charged with managing the company's day-to-day operations.[62]
In November 2012, Frontier started low-frequency service between Orlando International Airport and Trenton–Mercer Airport near Trenton, New Jersey,[40] which, at the time, had no commercial service. Frontier later expanded service several times from Trenton, and as of June 2016 services 11 destinations. Frontier currently bases three aircraft in Trenton.[citation needed] Trenton Mercer Airport lies roughly equidistant between Philadelphia International Airport and Newark Liberty International Airport.[citation needed]
The airport director in Worcester, Massachusetts, felt that Allegiant reneged on a commitment to serve the airport for five years given the use of federal grants to assist its startup. However, the airline responded that the market was immediately unprofitable and starting service there was a poor decision; flights were reported to be 80% full.[51] Allegiant's flights average 90% full.[42]
Frontier has a three-tier frequent flyer status program. The tiers are Elite 20K (earned by flying 20,000 Status Qualifying Miles [SQM] or 25 segments in a calendar year), Elite 50K (50,000 SQM or 50 segments), and Elite 100K (100,000 SQM or 100 segments). Elite benefits include free carry-on and checked bags, advance seat assignment and family seating, priority boarding, redemption fee waiver, stretch seating, Discount Den membership, and mileage multipliers.[74]
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]

On June 22, 2009, Frontier Airlines announced that pending bankruptcy court approval, Republic Airways Holdings, the Indianapolis-based parent company of Republic Airlines, would acquire all assets of Frontier Airlines for the amount of $108 million. Thus, Frontier Airlines would become a wholly owned subsidiary of Republic.[26] However, 5 weeks later on July 30, Dallas-based Southwest Airlines announced that it would be making a competing bid of $113.6 million for Frontier with intentions to also operate Frontier as a wholly owned subsidiary, but that it would gradually fold Frontier resources into current Southwest operating assets.[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.
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