, at least, on the (rather expansive) UA
ramp area, no chances are taken. I can only speak as a passenger, but it seems (from many experiences) that any strikes in the near vicinity are cause to shut down the entire ramp. I've been inconvenienced by it many times, but as all professional aviators realize, safety is the #1 most important thing in aviation, and I've always 'suffered' in silence. Much better I'm a few minutes later to my destination than anyone suffers injury or, God forbid, death.