I have never been too cold on a flight. It seems sensible to err on the cold side; those feeling cold can always wrap themselves in blankets to stay warm. Flying from HKJK I am always amazed at how many fellow passengers are wrapped up in jackets, scarves, hats and blankets while I am in a short-sleeved shirt. But I have been too hot. And I am often amazed by the steep temperature gradients as you move around the aircraft, so I can see that it must be impossible to get it right for everyone.