1. Firm, STONE-WRITTEN limits on the maximum permissible length of a delay before the flight MUST be cancelled. (e.g., 180 mins. domestic, 240 mins. intl.)
2. An end to the lie that ATC cancels flights. I have already explained the background on this before.
3. The ability to get off a flight that is delayed over 120 mins., with a full refund offered, no questions asked.
#3 can be flexed a bit, but 1 and 2 are non-negotiable, IMHO.