Who's rebooking you? Your company? Or is Delta putting you on a United flight?

To answer your question on "how would they know" is that the best way to know is to error on the side of caution. I'm pretty sure Falcon Air found this out the hard way during the Spirit strike. If it smells remotely fishy, don't fly it.

Will there be scenarios where a passenger who was on that Delta flight that is now canceled because of a strike, buys a ticket on United to get where they're going? Sure, is that struck work? No.

We can think of grey area scenarios all day long but it doesn't really apply here. Any cargo that was to be carried out by ABX that day is struck work.

Accelerated FO?

Just announced, we now have a reciprocal jumpset with Fedex.

To date we have the following: Fedex, UPS, Southwest, Virgin America, Skywest, Atlas/Polar, Mokulele, Western Global, Allegiant Air, Seaborne, Southern Air, and Spirit.

Your pilots do not have a reciprocal with SkyWest pilots.

Whether there is a reciprocal agreement or not, I have flown Delta Connection Skywest, no problem. United Express might be a different story.

If you AND your family can not go to the airport and fly for free to Europe or Asia, I would not call them real flight benefits and isn't really even worth mentioning.

Some individual pilots may let you on Delta or United flights, but there is no written reciprocal agreement.

You can jump seat on anyone that will let you.

The answer is no there is not.

There is more to it than a blind shot in the dark request on Skywest. There has been work done behind the scenes. Check in at Delta, it works, United, proabably not. Troll on.