In most cases the airlines use pretty good common sense. All of my really bad experiences have involved being diverted. Mostly while trying to get into jfk. It is tough for the airline when they get diverted to an airport where they have no presence or where there is no ability to off load international passengers. I would think if I. The above mentioned conditions the airline can off load they would and it is very hard for the dot to anticipate some of the other situati9ns that occur. Like I said mine have mostly been weather related