A female passenger had fainted and Dr. Conrad Murray, who was aboard the same plane Saturday, administered IV fluids, the woman told TMZ.
The woman -- described as in her 20s and traveling with a baby -- reportedly had a "very weak pulse" and was unresponsive for about a half-hour, sources told TMZ.
The victim told the entertainment news Web site, when she came to, she found Murray standing over her.
She told TMZ he told her: "You probably know me ... I was Michael Jackson's doctor."
Upon landing, the woman was treated at a Phoenix hospital and released, TMZ said.
Murray was charged in February with involuntary manslaughter for his alleged role in Jackson's June 25, 2009 death from a drug overdose. He has pleaded innocent and retains his medical license.