I just found this:
"91.117 Aircraft Speed
(a) Unless otherwise authorized by the Administator, no person may operate an aircraft below 10,000ft MSL at an indicated airspeed of more than 250 knots.
(b) Unless otherwise authorized or required by ATC, no person may operate an aircraft at or below 2,500 feet above the surface within 4 nautical miles of the primary airport of a Class C or Class D airspace area at an indicated airspeed of more than 200 knots. This paragraph (b) does not apply to any operations within a Class B airspace area. Such operations shall comply with paragraph (a) of this section.
© No person may operate an aircraft in the airspace underlying a Class B airspace area designated for an airport or in a VFR corridor designated through such a Class B airspace area, at an indicated airspeed of more than 200 knots.
(d) If the minimum safe airspeed for any particular operation is greater than the maximum speed prescribed in this section, the aircraft may be operated at that minimum speed."
So I guess (a) maybe applied in this case (as well as the next SWA plane to pass by, this one from Phoenix rather than El Paos). Obviously, I’m too far out for (b) to apply.