I just bought an ID95 from Delta a few weeks ago. It was around $53 HNL-LAX. Each airline has different rules about who can and cannot fly on their carrier with ID90 priveleges. Some won't take travel companions (not sure if that's just a CAL thing), some won't take parents (Philippines Airlines), some will take parents and children but they must fly ID75.

If you're an airline employee I understand that you can just walk up to every ticket counter (that's exactly what I do) and ask if there are empty seats and their personal opinion of whether or not you can get on the flight, space available. Some airlines won't give you numbers, which can be kind of a pain in the butt if you have to be on duty in say, 24-36 hours.

You buy ID90's at your company's ticket counter.

Hope this helps,

Chris