Three Part Answer...

Part One: If you are done with work, finished with company duty, on your way home as a commuter you are free to have a frosty or two (nonreving, not jumpseating).

Part Two: If you are done with flying, but non-reving back to domicile (or other company location) on a company positive space ticket, you are OK to drink as far as the FAA goes.

Part Three: However...If you are done with flying, but non-reving back to domicile (or other company location) on a company positive space ticket, most companies consider you to still be in a duty status...even if you have timed out for 121. Airlines have fired people for doing that, and it would go on your record as drunk on duty.

Two ways they could find out:

- The re-assign you some flying when you arrive (perhaps part 91 repo, Mx, etc). If you were not expecting this, they might let you off the hook, depending on their junior-man policy.

- You get a random drug/alcohol test when you arrive. If your number comes up and they notify you, nothing will save you in this scenario, you are banned from the airlines for life. I don't think the company even has the discretion to cancel the drug test once it is scheduled. It is common for airlines to do random tests at the end of a trip so they do not delay revenue flying...even though they would probably not really mind you having a drink after you thought you were done.

If you are still in a company duty status, I wouldn't drink, ever.