11:54 AM PST: Rick Ross -- who's still in the hospital -- is telling people he still plans to perform tonight in Memphis at FedExForum. 11:05 AM PST: It appears Rick Ross is now tweeting, claiming he is okay.
10:57 AM PST: Ross was transported to a nearby hospital.
A family member tells TMZ, Rick is currently under close supervision and is doing fine. We're told drugs and alcohol were not involved.
10:50 AM PST: Rapper Wale -- one of Rick's closest friends -- just tweeted, "I just talked to Ross...he's 100 pct ok.." Another member of Rick's entourage DJ Sam Sneaker also says the rapper is okay.
10:36 AM PST: A witness tells TMZ, Rick fell unconscious right after take-off.
We're told his entourage jumped out of their seats to alert plane personnel -- at which point a doctor on board administered CPR on the rapper.
The plane made an emergency landing right away -- and we're told, as Rick was being wheeled off the aircraft, he appeared to show signs of life. Story developing ...