SkyWest Employee and eligibles:
On SkyWest flights, UNLIMITED and FREE.
SkyWest Buddy Passes:
Buddy Passes valid for travel on SkyWest only. (SkyWest Delta Connection and United Express - the new agreement with Continental hasn't been published yet but I'll assume same)
One-way segment-to-segment travel
Qualifying employees (after six months) allotted 24 segments per year.
$30.00 per segment.
Delta Air Lines:
After 90 days, ID100 for domestic US, also $10 one-way to Alaska, Hawaii, and Canada (service charge for government-imposed departure and airport taxes.

ID95 international.
United:
United Write-your-owns (WYO) after 14 days. United's WYO costs are calculated using:
1. a fixed base price (a per segment/coupon charge)
2. A mileage charge
3. Government taxes
The example we were given: Chicago (ORD) to Los Angeles (LAX) in Economy class = about $18.31
And other airlines we've got lots of ZED (Zonal Employee Discounts) and one-way service charge benefits.
Pilots and Dispatcher jumpseat priveleges with bunches of airlines with reciprocal travel agreements (of course we dispatchers get the shaft from a lot of airlines and aren't included in the agreement or specifically stated NO DISPATCHERS, what's up with that?).