Originally Posted by
LukeSkywaiter
Let's see... extra fuel $$, landing fees, parking fees, ground service fees... yeah I'm pretty sure the easy answer is because that would be a poor financial decision. You bought a ticket to IAH, not AUS or SAT, and the company has no obligation to get you there until it's in the best interest of your safety to do so.
I think what he meant was, file a new flight plan to AUS and while in route, change it back to IAH so as to avoid the ground stop.