In December 2016, a winter weather event disrupted fleet operations, causing Frontier to delay or cancel up to 70% of their flights during the peak of the crisis, many without any advance notice. On the weekend of December 17, the storm caused major delays at Frontier's Denver hub, and the effects of the storm were felt throughout the fleet.[59] Flights were delayed or canceled at airports across the country, as in some cases, planes were ready to depart, but there were no rested flight crews available to service the flight.[60] The head of Frontier's pilot's union issued a statement criticizing the companies' handling of the event, comparing the airline to a "house of cards".[61] Frontier received over 30,000 refund requests for canceled flights resulting from the event.[citation needed]
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 was ranked in an airline quality rating report by Embry-Riddle Aeronautical University and Wichita State University in 2015 as one of the five worst airlines in the United States, especially due to its rate of customer complaints and bumped passengers.[88][51][89] The airline also had relatively poor on-time performance, and the waiting time for help when calling the airline on the phone was reported to have risen to two hours or more.[90]
In February 2002, the airline launched its first regional product, Frontier JetExpress, initially operated by Mesa Airlines using CRJ-200 regional jets. Similar to "express" operations of other carriers, Frontier JetExpress was targeted for markets to and from Denver that do not generate traffic sufficient to support Frontier's smallest mainline jet, the Airbus A318, but could still offer lucrative business with a smaller jet.
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On January 11, 2007, Frontier Airlines signed an 11-year service agreement with Republic Airlines. Under the agreement, Republic was to operate 17, 76-seat Embraer 170 aircraft for the former Frontier JetExpress operations. At the time the contract was canceled in April 2008, Republic Airlines operated 11 aircraft for Frontier Airlines, with the remaining six aircraft expected to join the fleet by December 2008. With the integration of Republic aircraft, the 'JetExpress' denotation was removed. Subsequent to the cessation of Horizon's services for Frontier in December 2007, all flights operated by Republic were sold and marketed as "Frontier Airlines, operated by Republic Airlines." The first market created specifically for the Embraer 170 was Louisville, Kentucky, which began on April 1, 2007. Service to Louisville was suspended in August 2008 but restarted in April 2010.[citation needed]

Nevada-based Allegiant (G4) is a low-cost carrier that flies all Economy Class aircraft to about 100 destinations in 40 US states. On many routes, it only operates a couple times a week, and it typically flies to smaller, regional airports. However, Allegiant's focus cities include a mix of smaller and larger airports, including Bellingham International Airport (BLI), Fort Lauderdale–Hollywood International Airport (FLL), Los Angeles International Airport (LAX), Las Vegas's McCarran International Airport (LAS) and Phoenix–Mesa Gateway Airport (AZA).
Also in 2010, JetBlue entered into interline booking agreements with South African Airways[109] and American Airlines[110] to facilitate luggage transfers between airlines for passengers with connecting flights on a different carrier. The agreement with American included JetBlue's 18 destinations not served by American and American's 12 international flights out of New York–JFK and Boston Logan. In addition, American gave JetBlue 8 round trips slots out of Washington National in D.C. and 2 out of Westchester, New York. In return, JetBlue gave American 6 round trips out of New York–JFK. The agreement with American Airlines has since ended according to JetBlue's website.[111]
In March 22, 2010, jetBlue turned down incentives from the City of Orlando and announced its headquarters would keep its Forest Hills office,[46][47][48][49] start leasing and using a new office in the Brewster Building in Long Island City, New York.[50][51] in Queens Plaza in Long Island City,[49] move its headquarters there in mid-2012,[52] and start a joint branding deal with New York State using the iconic I Love NY logo.[49]
March 27, 2012: Flight 191 en route from New York City, to Las Vegas performed an emergency landing at Rick Husband Amarillo International Airport after the captain, Clayton Osbon, was locked out of the cockpit and subdued by passengers after he started acting erratically and ranting about terrorist. It is believed that Osbon suffered from an unspecified mental breakdown, and was treated by Northwest Texas Healthcare System. There were no fatalities.[148][149][150]
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. 

On July 24, 2007, jetBlue reported that its second-quarter revenue increased to $730 million, compared to $612 in 2006. Second quarter net income grew to $21 million for the quarter, from $14 million the previous year. CEO David Barger said the airline will take delivery of three fewer planes this year and will sell three planes from their current fleet, "slowing capacity growth ... to strengthen our balance sheet and facilitate earnings growth", but will continue to add two to four new destinations each year.[25]
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