On this continuum, the level of professional skepticism moves from something less than complete trust, to a neutral mind-set, to presumptive doubt, and all the way to complete doubt. The appropriate level of skepticism to apply is initially determined only after a careful and rigorous risk assessment.
1 The longest flying aircraft flying from Kansas City, MO to Cancun, Mexico during the 2009 year was a AirbusNdustrie's A319 flown by Frontier.  Back in 2009 there was just one airline company operating flights between Kansas City and Cancun.
United flight 1062 to Kansas City International Airport was the first to depart and United flight 1474 from Colorado Springs Airport was the first to arrive. After the airport's runways were completed but before it opened, the airport used the codes (IATA: DVX, ICAO: KDVX).