My head is exploding by seeing all the flights departing to nowhere since no gates are available at JFK at the moment.
Airlines should cancel flights from origin, not in flight. As you say, total waste of time and money.
The chaos at JFK (don't know at other airports) is clear. A collision has occured and I'm sure more incidents are about to happen not counting the Air China waiting for a gate for 7 hours sitting on the tarmac...
Thanks for your time, Geoff!