Can you buy your own commercial flight tickets with govcc?

No, the tickets have to be purchased through travel or DFAS won't reimburse them. The part of using IBA refers to you will use your own GTC to pay for the tickets. Soldiers without a GTC have their tickets charged to a central account.

Depending on where you are going you can be authorized a stop on the way out. If you're PCSing to Korea, you're taking the Patriot express.

Years ago I did it for my convenience and Uncle Sam paid me the government cost of the ticket. I'll make up some numbers as an example. I paid $150; however, Uncle Sam's ticket was $100. I lost $50, but it was more convenient for me. Ask for a waiver.

From CONUS to OCONUS, if you are single you can't. To use your GOVCC it has to be activated by your DTS personnel, however; I do not think they will authorize for a commercial flight.