Thousands gathered for a fly-past honouring US airmen killed in 1944
The plane came down in a park in Sheffield where children were playing
One of those children, Tony Foulds, was so moved he's cared for a memorial to airmen for decades
BBC presenter Dan Walker met Tony and was inspired to help him achieve his dream of a fly-past
Planes from three RAF bases joined today's fly-past
Learn about the men who died in the crash in 1944
Eyewitness describes doomed plane's last moments
Planes from three RAF bases will join today's fly-past, if the weather holds.
The BBC's Matt Taylor is at RAF Coningsby and says they're keeping a "close eye" on the conditions.
There are some worries about the fog at the airfield:
John Henry
BBC Local Live
People are gathering to remember the crew of the Mi Amigo who lost their lives in the crash in 1944, but who were the US airmen aboard the B-17 Flying Fortress:
You may have read a lot about the fly-past in Sheffield today and the crew of the Mi Amigo plane, but do you know about the man behind the fly-past?
Tony Foulds was eight-years-old when he saw the US B-17 bomber crash in 1944.
He was playing in the park with friends when he saw the plane come down in the woods.
He said he felt responsible because the plane was trying to avoid crashing into him and his friends.
He's regularly cared for the memorial since it was built in the 1960s and when BBC Breakfast presenter Dan Walker met him, he was inspired to mark the anniversary in style:
Oli Constable
BBC Yorkshire Live
As morning breaks over Endcliffe Park you can see a large number of people gathering ahead of the fly-past later.
Among them are a large number of veterans, serving military men and women and young cadets.
There's also a number of local civic dignitaries.
If you're heading out to catch a glimpse of the planes over Sheffield as part of this morning's fly-past, there are plenty of places to see them.
Image source, Google Maps/Getty ImagesWe're expecting a mix of both US and UK aircraft, including an F-15E fighter jet, Typhoons, Ospreys and a Dakota.
It's thought they will fly over in a staggered formation because of airspace restrictions, so hopefully it won't be a "blink-and-you'll-miss-it" moment.
Flying from the south east, they're going to be following the red line above.
The main action will happen over Endcliffe Park near the city centre at 08:45.
Potential viewers are asked to arrive using public transport or on foot by 07:15 as it's expected to be very busy, but we'll keep you updated on events here and hope to bring you a live video feed too.
There is no car parking near the park, so if you haven't already arrived, you might be out of luck.
The council also recommends vantage points like Bolehills Park, Park Hill flats, Skye Edge playing fields and the Botanical Gardens.
If you're heading to the fly-past later, expect crowds, a bit of waiting around and decent weather.
The fly-past will mark the anniversary of a fatal crash of a US B-17 Flying Fortress at the park in 1944 which killed 10 American airmen.
Thousands of people are expected to make the trip to Endcliffe Park which means traffic around the area will be very busy.
Sheffield City Council is asking people not to drive as there won't be any parking available.
Instead, bus services will drop people off at the park gates, with free travel for members of the armed forces and veterans with valid ID cards.
Oli Constable
BBC Yorkshire Live
Crowds are already starting to gather ahead of the fly-past this morning in Sheffield's Endcliffe Park.
BBC Breakfast are broadcasting here all morning and there's a big screen on the grass.
Young cadets will join members of the US and UK military here.
Thousands of onlookers are expected to descend on the park over the next couple of hours.
Welcome to our live coverage of a fly-past due to take place later to mark the 75th anniversary of a fatal plane crash in a Sheffield park.
Image source, OtherThe US bomber - a B-17 Flying Fortress known as Mi Amigo - came down in Endcliffe Park in 1944, killing all 10 airmen on board.
It comes after a successful campaign led by BBC Breakfast presenter Dan Walker to get a fly-past to mark the anniversary.
Image source, Dan WalkerThe campaign began after Mr Walker met Tony Foulds, who witnessed the crash and regularly tends to the memorial.
The event, which will be focused on Endcliffe Park, is due to include a fly-past at 08:45, with US and UK aircraft including Ospreys, Typhoons and a Dakota taking part.
With thousands of people expected to descend on Sheffield's Endcliffe Park on Friday for a very special fly-past, what's the weather going to be like?
BBC Look North's Paul Hudson has the answer:
If you're heading to the Endcliffe Park fly-past in Sheffield on Friday, expect crowds, a bit of waiting around and - hopefully - some decent weather.
The fly-past will mark the anniversary of a fatal crash of a US B-17 Flying Fortress at the park in 1944 which killed 10 American airmen.
Thousands of people are expected to make the trip to Endcliffe Park which means traffic around the area will be very busy.
Sheffield City Council is asking people not to drive as there won't be any parking available.
Instead, bus services will drop people off at the park gates, with free travel for members of the armed forces and veterans with valid ID cards.
People are asked to arrive in good time, at about 07:15, to get their spot for the show on the open field in Endcliffe Park.
It looks like the weather for tomorrow will be dry too, with temperatures at about 11C (52F).
If you want to catch a glimpse of tomorrow's anniversary fly-past in the skies over Sheffield, there are plenty of places to see it.
Image source, Google/Getty ImagesThe fly-past will mark the anniversary of a fatal plane crash in a Sheffield park in 1944 and will take place after a campaign led by BBC Breakfast presenter Dan Walker.
We're expecting a mix of aircraft, including an F-15 fighter jet, Typhoons, Ospreys and a Dakota.
It's thought that they will fly over in a staggered formation, so it won't be a "blink-and-you'll-miss-it" moment, following the red line above.
The main action will happen over Endcliffe Park near the city centre at 08:45 on Friday.
But if you're wanting to watch it there, you're asked to arrive using public transport or on foot by 07:15.
There will be no car parking near the park.
The council also recommends vantage points like Bolehills Park, Park Hill flats, Skye Edge playing fields and the Botanical Gardens.
Heading out to see the fly-past at Endcliffe Park in Sheffield on Friday morning?
Wondering what formations they'll be flying in?
Want to know where to look...and when?
This is what to expect from the pilots themselves:
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Welcome to our coverage ahead of a very special fly-past which is due to happen tomorrow to mark the 75th anniversary of a fatal plane crash in a Sheffield park.
Image source, OtherThe US bomber - a B-17 Flying Fortress known as Mi Amigo - came down in Endcliffe Park, Sheffield, in 1944 killing all 10 airmen on board.
There was a campaign, led by BBC Breakfast presenter Dan Walker, to get a fly-past to mark the anniversary.
Image source, Dan WalkerThe campaign began after Mr Walker met Tony Foulds, who witnessed the crash and who regularly tends to the memorial.
The event, which will be focused at Endcliffe Park, will include a fly-past at 08:45 with US and UK aircraft including Ospreys, Typhoons and a Dakota taking part.