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.
How long is a flight from New York to Cancun Mexico?   Answer     The results of your search for New York, NY (NYC) to Cancun (CUN)     Shortest Flight Duration  4 hours 0 mins  . Answer     How long of a flight is it from Philadelphia PA to Cancun?     Considering your connection through Miami or another location approx 6 hours.