How does splitting time building help costs?

[PeterNSteinmetz]

I recently received an email through a rental outfit looking for someone to help split time-building costs. While I am not personally interested, I am wondering how this helps reduce costs?

If only one person is logging PIC it doesn't seem like it would help much. The only situation I can think of would be one person acting as safety pilot on simulated instrument time.

Any other thoughts about it?

 

[Jim Logajan]

Perhaps it is meant for CFIs who want to build time toward airline requirements. Just need any student who may also be a CFI who wants to build time, so one is in training while one acts as instructor. Dubious, but that is all I can think of. Somebody asked a question about that scenario here:
https://www.askacfi.com/32800/cfi-splitting-costs-building-time-with-student.htm