Plenty of offline jumpseaters in STL yesterday and they got on just fine. List at the counter if the number is busy and try and let someone from the crew know you are there if they happen to pop up from the airplane. 99 percent of captains won't leave a man behind.
That being said, the above advice about finding another carrier for the next 3-4 days until this settles down is pretty good advice unless you have no alternative.