Originally Posted by rickair7777

ZED and ID90 are how you non-rev on airlines other than the one(s) you work for. On your own airline, (and their major partner(s) ) you can list yourself using a web page or phone number, it's basically an e-ticket for standby travel. You can do this on the fly, at the last second while you are walking up to the gate.

To non-rev on most other airlines (depending on agreements with your airline), you buy a voucher for a reduced fare standby ticket. The disadvantage is you need some advance notice for the destinations and airline(s) you want to use, and you have a lower standby prior than on your own airline (and affiliated airlines).

ID90: Basically you pay 10% of the full-fare walk-up price. ID95 would be 5% of the regular fare.
ZED: You pay a fare based on the mileage between city-pairs (this is new and is replacing ID90.