On November 15, 2017 Frontier Airlines announced a $15 billion order for 134 additional A320neo family aircraft. The order, slightly revised under new owner Indigo, consists of 100 A320neo and 34 A321neo. The order also includes the conversion of the remaining A319neo to A320neo.[80] With this order, Frontier Airlines fleet has industry-leading fuel efficiency. The fleet is also one of the most modern and young, particularly in comparison to other low-cost carriers,[nt 1] at an average age of 5 years as of 2018.[81]
LIARS & SCAMMERS.  Don't trust anything.  Made a reservation for a rental car in Denver (Advantage) for a funeral trip.  After waiting in line for an hour with only 3 agents helping a mass of people, the rental agent, "Aric," offered us a Yukon XL in place of the Camry we reserved.  He said it was because we had waited in line for an hour and we were in Denver for a funeral.  He said, "I'm going to give you guys a Yukon and free gas as well."  We asked repeatedly if this would change the price because we didn't want to pay any extra.  He told us to return the vehicle empty.  He assured us more than once that this was just his gift to us and there would be no extra cost.   He also added an additional driver also at no cost, so he said.  The Yukon reeked of cigarette smoke and was very dirty but after waiting in line so long we just bought Febreeze and dealt with it ourselves.  Aric made sure to ask us for a nice survey and recommendation when we got home as well. Our reservation was for $125.95 but we were charged $438.54!!  Now wasting time fighting this. Unbelievable.
Buyer beware! Do not use this service! I booked a trip for my son and then needed to change the reservation the next day. The customer service person said to cancel the first trip and "re book the whole reservation again (my son needed to stay 2 extra days). A partial refund came in 2 days later for the cost of the hotel. The refund was short $500.00 for the airfare. I called after about 6 days and was told it was being processed and would take up to 7 days. I called 5 days later (day 11) and was told it was processed and the hold up was on the part of my bank. I called the bank who had no record of this at all. They are now disputing the charges with Travelocity. It's been a time consuming and aggravating nightmare. Be aware and careful before you use Travelocity. In looking at their reviews this is not an isolated instance. They seem to have very poor business practices throughout!
In January 2010, the airline celebrated its one-millionth passenger to fly out of Phoenix-Mesa Gateway Airport. Allegiant's parent company also announced that it had purchased 18 new MD-80 aircraft from Scandinavian Airlines.[20] In February 2010, Allegiant opened its ninth base at Grand Rapids' Gerald R. Ford International Airport in Michigan. The airline based two McDonnell Douglas MD-80 aircraft in Grand Rapids, but ended their airport's status in 2011. The airline continues to fly out of Grand Rapids in a reduced capacity.[21]
In January 2008, Allegiant opened its sixth base at Washington's Bellingham International Airport. The airline bases two McDonnell Douglas MD-80 aircraft in Bellingham as part of the expansion.[19] Routes served exclusively from Bellingham include Las Vegas, Palm Springs, San Diego, San Francisco and Phoenix. Expansion in Bellingham has been largely driven by its proximity to Greater Vancouver, British Columbia.

A November 2016 analysis by the Tampa Bay Times noted that Allegiant's planes were four times more likely to have in-flight failures than other major US airlines.[64] A 60 Minutes report by CBS News in 2018 continued to investigate the issues first raised by the Tampa Bay Times.[65] Public records cited in the investigation found that the airline had more than 100 serious mechanical incidents between January 1, 2016 and October 31, 2017, including "mid-air engine failures, smoke and fumes in the cabin, rapid descents, flight control malfunctions, hydraulic leaks and aborted takeoffs."[65] Other public records further revealed that Allegiant aircraft, on average, were nearly three and a half times more likely to have mid-air breakdowns than American, United, Delta, JetBlue and Spirit.[65]
Allegiant Air has been closely monitored by the FAA due to many emergency landings and aborted takeoffs.[56] ABC interviewed a former Allegiant mechanic, who said "Dedicated steps were not being performed with maintenance manuals or even with general practices, before an aircraft is released."[57] Many of these incidents had involved Allegiant's aging MD-80 aircraft, which as of November 2018 have been replaced by newer Airbus A320 family aircraft.[58][50] 46 of the 86 aircraft have made emergency landings, all of which were on MD-80s.[59] The average age of Allegiant's MD-80 fleet was 29 years compared to less than 13 years for its Airbus fleet.[58]
In March 2010, Allegiant purchased six used Boeing 757-200 jetliners as part of plans to begin flights to Hawaii, with deliveries from early 2010 to the fourth quarter of 2011.[25] It gained the approval for type with the FAA in July 2011,[26] and then worked with the FAA to obtain the appropriate ETOPS rating in order to be able to serve Hawaii. Allegiant no longer operates nonstop service to Honolulu from Las Vegas.[27]
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