Cal. Pub. Util. Code § 21662.4
(b) As used in this section, “emergency aircraft flights for medical purposes” are those flights in which undue delay would threaten a patient’s life. “Emergency aircraft flights for medical purposes” include, but are not limited to, flights for the transportation of any of the following:
(8) Aircraft or equipment used during a medical emergency, or emergency personnel and first responders involved in treating the medical emergency, for the purpose of returning to its base of operation.
“Emergency aircraft flights for medical purposes” do not include the transportation of medical personnel to attend seminars, conferences, or speaking appearances in which undue delay would not jeopardize any patient’s medical condition.
(c)