Floyd Mayweather: I Own That New Jet, It's Not a Charter!

Floyd Mayweather tells TMZ Sports ... that brand new jet he posted on social belongs to HIM -- explaining, "I'm not posting a private jet if I'm chartering."

Floyd gifted himself the new plane for his 41st birthday -- by our count, it's the THIRD private jet Floyd has purchased for himself in the past couple of years.

We spoke with Mayweather about his aircraft fleet -- here's what he told us:

"I'm not posting a private jet if I'm chartering. If I'm chartering a jet, I'm not posting it. We own jets."

The new jet appears to sit at least 14 people comfortably -- plus the flight crew.