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

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]
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]

jetBlue expanded service to the Caribbean, including to St. Maarten and Puerto Plata commencing January 10, 2008. With these additional destinations, jetBlue serves a total of twelve Caribbean/Atlantic destinations including Aruba; Barbados; Bermuda; Cancún; Nassau; Aguadilla; Ponce; San Juan, Puerto Rico; Santiago; and Santo Domingo, Dominican Republic.[citation needed]
In July 2016, jetBlue announced commercial flights from the United States to Cuba will commence in late August.[64][65] On August 31, 2016, JetBlue Flight 387 from Fort Lauderdale–Hollywood International Airport to Abel Santamaría Airport, in Santa Clara, became the first scheduled commercial flight between the United States and Cuba in 55 years.[66] Only charter flights were allowed under previous rules, which required that passengers had to arrive more than 4 hours before the scheduled departure and often endure long lines for documentation checks, late flight arrivals, and pay high baggage fees.[67]
On March 22, 2010, jetBlue announced it would remain in the New York City area, in Long Island City,[88] because of the airline's historical links to the city, the cost of staff relocations, the airline's desire to retain access to financial markets, and because Aer Lingus and Lufthansa, jetBlue's marketing partners, fly into JFK Airport.[89] jetBlue planned to combine its Forest Hills and Darien, Connecticut offices, together about 1,000 employees, into about 200,000 square feet (19,000 m2) in the Brewster Building by mid-2012.[90]
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
Today, it serves 77 cities on 176 routes. They cover destinations like Bellingham, Washington, Vancouver, British Columbia, Fort Lauderdale, Las Vegas, Nevada, Los Angeles, California, Myrtle Beach, Orlando, PhoenixMesa, Arizona, San Francisco Bay, Fort Myers and Tampa Bay or St. Petersburg-Clearwater. They have their operation bases at Bellingham International Airport, Fort Lauderdale-Hollywood International Airport, Las Vegas McCarran International Airport, Los Angeles International Airport, Oakland International Airport, Orlando-Sanford International Airport, PhoenixMesa Gateway Airport and St. Petersburg-Clearwater International Airport.
In July 2012, the U.S. Department of Transportation fined Travelocity $180,000 after discovering that Travelocity's “flexible dates tool” did not always include fuel surcharges that were part of many international airfares in violation of the Department's rules requiring all carrier-imposed surcharges and fees to be included in every advertised fare. In addition, the DOT found that the customer was informed only on the final page before purchasing the ticket that some itineraries required a paper ticket with a minimum additional delivery fee of $29.95.[29]

Frontier Airlines was incorporated on February 8, 1994, by a group that included executives of the original incarnation of Frontier Airlines in response to the void left by Continental Airlines' 1993 shutdown of its Denver (Stapleton) hub.[17] Scheduled flights began five months later in July 1994 using Boeing 737-200 jetliners on routes between Denver and four destinations in North Dakota: Bismarck, Minot, Fargo and Grand Forks. By January 1995, Frontier had expanded its route network from Denver and was serving Albuquerque, New Mexico; Billings, Montana; Bismarck, N.D.; Bozeman, Montana; El Paso, Texas; Fargo, N.D.; Great Falls, Montana; Las Vegas, Nevada; Missoula, Montana; Omaha, Nebraska; and Tucson, Arizona with 737's.[18] Like the original airline of the same name, the new Frontier operated a hub at Denver (DEN) and for the first nine years used the slogan "The Spirit of the West" which was displayed above the windows and just behind the cursive letters "Frontier" on the fuselage of their aircraft. In 1999, Frontier signed agreements to begin purchasing and leasing Airbus A318 and A319 jet aircraft and had also added Boeing 737-300 jetliners to its fleet as well. Also by September 1999, the airline was serving destinations from coast to coast in the U.S., having expanded its route network to include Atlanta (ATL); Baltimore (BWI); Bloomington/Normal, Illinois (BMI); Boston (BOS); Chicago (MDW, Midway Airport); Dallas/Fort Worth (DFW); Phoenix (PHX); Los Angeles (LAX); Minneapolis/St. Paul (MSP); New York City (LGA, LaGuardia Airport); Orlando (MCO); Portland, Oregon (PDX); Salt Lake City (SLC); San Diego (SAN); San Francisco (SFO); and Seattle (SEA), all served from its Denver hub.[19]
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]
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. 
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