Lucky:

UA doesn't seem to track it very closely. I just tell them when I have mil duty (as a part-timer), and they say "Let us know when you are back." Occasionally they ask for verification from a squadron supervisor, but that is reasonable. They've never told me "You've used up this many days, and have this many left."

Friends at Delta, though, seem to have every day and hour tracked.

After many years of being a part-timer in the Reserves, I probably have 3 years-worth of mil days/mil leave. If I get the recall to active, does that mean UA will only give me 2 years under USERRA? Possibly. On the other hand, they seem so eager to get rid of people (call it a different way to voluntarily furlough) that it may be moot. If I had to, I would finish it under a personal leave.

And if I get "real furloughed" while on active, also moot.