Cheap corporate/charter operators do that to legally pad the times for insurance purposes. Airlines don't care about that...

Airlines want to see PIC time in accordance with Part 1 (ie. responsible for the aircraft), and don't care about Part 61 PIC (ie. sole manipulator).

Its your logbook, log it how you want to...but be fully prepared to justify in an interview why you logged a bunch of turbine PIC time when you were a first officer who never signed for the plane AND for the people interviewing you to frown upon your reasoning.

IMO, doing so is a high risk/low reward proposition.

This is a great question.

The short answer is BOTH pilots.

While the captain may sign the release, both pilots are equally responsible for the safe outcome of the flight. If the captain misses something in the mx log and you go flying with an open writeup? Yep, both of you get violated.

But one of us gets paid considerably less.

Thanks for the replies. I wasn't going to count it. Just made me think about and how a senior wide body captain disconnected from the real word.

At a bunch of regionals the FO also signs the release...

Only log it if you're in the left seat (unless you're an LCA)

Simple real answer....dont be an idiot and log PIC as a 121 regional FO. The Capt is the PIC on the release. He/she will be the PIC, it will be a guarantee you will be turned away by a major at the interview.

What idiot would log PIC time as a regular line FO in 121? That's an instant application shredder, as it should be.

My FO can log whatever the heck he wants. Its his logbook. However, he knows WHO is in charge and thats NOT him.

No. You are not the PIC. Whoever told the OP that is very old and confused.