Early morning contrails of flights from America

Looking out over the valley, I was surprised to see so many contrails. marking the descent of flights from north American countries as they head for London's Heathrow Airport. Over the last couple of years because of the pandemic and the effects of lockdowns I would hardly ever see a contrail in the early morning, Previously they would be very common. It looks like the overnight arrivals are back in force. Not too good for the climate.