Burlington International Airport serves its metropolitan area, which contained over 219,433 residents as of 2019 U.S. Census estimates. Due to the relatively small size of the market, airlines mostly fly regional airliners on their Burlington routes. Among these are Bombardier CRJ-200, CRJ-700, and CRJ-900 and Embraer ERJ-145 and ERJ-175 regional jets operated by most of the major carriers. JetBlue, United Airlines, and Delta Air Lines notably fly some of the only daily flights using mainline aircraft. Currently the largest scheduled passenger planes to fly out of Burlington are Airbus A320 and Boeing 737 flown by United Airlines, Boeing 717s flown by Delta Air Lines, and Embraer E-190s flown year-round by JetBlue. Denver, Colorado is the farthest destination served by any airline out of BTV.