Originally Posted by
Denti
Isn't that only valid as long as one is over land or within the 12 miles zone along the coasts of the US? I thought over international waters ATC can issue speeds greater than 250kts below 10.000ft.
The regulations suggest that is correct
§ 91.101 Applicability.
This subpart prescribes flight rules governing the operation of aircraft within the United States and within 12 nautical miles from the coast of the United States.
in same part of regs
§ 91.117 Aircraft speed.
(a) Unless otherwise authorized by the Administrator, no person may operate an aircraft below 10,000 feet MSL at an indicated airspeed of more than 250 knots (288 m.p.h.).
... etc