in ORD, for September the most junior pure lineholder was a 8/2015 hire and most junior relief line holder was a 1/2016 hire.

Reserve rules are pretty standard. Most reserve lines are two hour callouts with three different reserve availability periods: 0400-1430, 1200-2230, and 1700-2400. That's basically the story, but there are some nuances from there. There's a couple of medium and long call out lines too which go up to a 12 hour callout. They will call with just two hours notice when you're on the standard call out.