Originally Posted by
atflyer
As indicated if one ticket always protected and such 1 hour connections should be doable, even if from Schengen to non Schengen and in reverse. You need to pass customs but there usually are short connection lanes if busy. And LON-AMS-SFO is a non Schengen-non Schengen connection...
Confused? OP won't need to clear customs at AMS.