British Airways plans to fly a Boeing 747 jumbo jet to Glasgow as part of its 100th birthday celebrations weekend in August.
The veteran giant aircraft is normally used for long-haul flights such as on transatlantic routes.
One of the planes is scheduled to operate the 1200 flight from Heathrow to Glasgow on Sunday 25 August, and the return service at 1500.
BA's predecessor, Aircraft Transport & Travel, launched its first route between London and Paris on that day a century ago.
747s are also due to fly on 25 August from Heathrow to Manchester and Newcastle.
There is speculation the aircraft to be used will BA's three jumbo jets which have been repainted for the anniversary year in previous BA liveries and those of its predecessor, British Overseas Airways Corporation, or BOAC.
Aviation firm Routes reported today: "British Airways filed one-time Boeing 747-400 aircraft service on selected domestic routes to/from London Heathrow, scheduled on 25 August.
London Heathrow-Glasgow: BA1482, departs 1200, arrives 1330.
"Glasgow-Heathrow BA1487, departs 1500, arrives 1625."
It is understood the special flights have still to be finalised and are not likely to be confirmed until next month.
A BA spokesman said on Tuesday 4 June: "We will be marking our birthday weekend and we will release our plans nearer the time."
However, three days later, there was speculation the 747s had been cancelled.
But BA would say only: We haven't revealed any of the details of our birthday weekend so far.
"Some aviation websites made a guess at what we were planning, but we were very clear that this was speculation.
"We understand some customers booked on these flights hoping they would be celebration flights, so have been in touch with those affected to offer a full refund for anyone who no longer wishes to travel."