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.
Distance and aircraft type by airline for flights from Kansas City International Airport to Cancun International Airport. 1  In 2009, we learned that Frontier flew around 7,821 passengers from MCI to CUN.  Way back in 2009, 7,821 passengers flew from Kansas City to Cancun. Today, this number has significantly increased.