In the fall of 2003 , Spirit resumed flights to Washington , D.C. 's Ronald Reagan Washington National Airport , which were suspended after the September 11 attacks . Spirit also began service to Grand Cayman , San Francisco , and Boston in 2006 , and in 2007 filed DOT applications to offer service to Costa Rica , Haiti , the Netherlands Antilles and Venezuela
September 11 attacks
September 11 attacks
Spirit Airlines