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.
The new flights will take off each Saturday from Raleigh-Durham International Airport, Kansas City International Airport, Nashville International Airport and Pittsburgh International Airport. With these additions, American now has nonstop service to Cancun from 12 different U.S. cities. The demand is certainly there.