Scanscanscan is spot on.
Minimum holding speed at high altitude in the Lockheed tri-motor is indeed LRC.
As the L10 has a true high-speed laminar flow wing, any slower is just asking for trouble, especially in -22B powered models.
I was once asked by London control to hold at 210KIAS at FL370.
Quite frankly, they really had positively no idea about jet transport aircraft performance at higher altitudes...then.
I wonder if it has improved?
