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 the flight from Manchester England to Cancun Mexico? It can take from 14 hours upwards to fly to Cancun, Mexico from Manchester, UK, depending on winds etc. Answer     How long of a flight is it from Philadelphia PA to Cancun?     Considering your connection through Miami or another location approx 6 hours.