This unfortunately ties in with the Guardian article that Mr A Tis linked about the fragile US market and the slump in interest and bookings to various US destinations as reported by Kayak and the like. The Guardian referred to it as the 'Trump Slump', and while that newspaper is very hostile to Trump, the figures shown can't easily be dismissed.
The other important factor is the fall in the value of sterling which resulted from the BREXIT vote (and I'm not arguing whether that was right or wrong) and makes holidays for UK tourists so much more expensive. It emphasises the point made by Sir HumphreyNorth in an earlier post as to how vital it is to get the message out in the States to encourage more Americans to use the Manchester flights. Otherwise, what was developing into an encouraging expansion of US flights from MAN could just as readily go into reverse.