Not a problem at all. On Sunday my son and I were booked on the 13:00ish flight to MAN. As we arrived at LHR I received a call advising me I might need to fly to JFK that evening. Rather than fly home to MAN and then have to fly back I called the GGL and changed our flight to the evening MAN at 20:20 - just in case I had to jump on one of the evening flights to JFK. We arrived at the CCR at 11:20 for our 20:20 MAN flight and apart from a 'welcome back Mr Tobias-UK' not a word was said.

In the end the crisis in New York was averted and we took the 20:20 up to MAN.