This is actually a bit of a complicated question:

If I'm flying, just a small relvolver, either my S&W 637 or LCR327.

If I'm driving, I'll add my other daily CCW, which is a 3" S&W M629. I will likely also add an auto in my satchel, for many years a 1911 Gov't, but lately a BHP with two extra high capacity mags and a holster.