If you work for SkyWest, you find the list on skywest online under travel, discounts, airlines. The travel center is very knowledgable with ZEDs, just call the employee line and listen to the prompts to get to connected to the travel center. Some of the counters (make sure it's skywest counter) don't have many dealings with ZEDs, check with the sup for help.

If you don't work for SkyWest, unfortunately every airline has different agreements... Check with your travel benefits department. Good luck and feel free to ask any other questions.