Thanks for the details, cws. sounds like these disruptions are happening everywhere and predicting them is a game of whack-a-mole.

Currently the early flight from LCY is wide open but everything from LHR is sold out on 17th and early 18th. Worth waiting to change the booking if I decide to change until later? Don’t want to find my ex-LHR 17th gets canceled, and the early LCY is sold out at that point on the 18th. But I don’t want to change if there’s a good chance ex-LHR on 17th will actually run