Here are excerpts from other articles mentioning ghost plane sightings:

This phenomenon has been occurring more and more frequently lately. People have seen and heard of plane crashes, only to find no wreckage or any records of the missing flights. This is a relatively new phenomenon, but it seems to be occurring worldwide.

Since World War II, more than 50 planes have crashed into the foggy slopes of Dark Peak in South Yorkshire, England. Many people have seen Lancaster bombers, or occasionally Dakotas, flying silently over the Hope Valley reserves. Some residents have called the police to report plane crashes, prompting search and rescue operations. One Peak Park ranger claims he's called out about three times a year to search for crashed planes, but he never finds anything. The ranger believes the problem is a delusion. There was a theory that IRA terrorists were flying over Peak Park, or that the government was responsible, but this theory was later dismissed by most police officers.

Emergency services in South Yorkshire received reports of a plane crashing into a quarry near Doncaster. Emergency services, including two helicopters, launched a fruitless search. A South Yorkshire Police spokesman said: "There have been numerous calls from people in the Hatfield and Doncaster areas who thought they saw a plane descending into fields, but an intensive search of the area has turned up nothing." There have also been no reports of any missing planes.

On July 26, 1998, near Skelmersdale, Lancashire, England, residents reported seeing a flame-engulfed plane crash into the ground, bursting into a fireball. Police, rescue teams, firefighters, and medics, along with helicopters, searched the area. Witnesses said the plane crashed in a field, trailing a plume of smoke. No plane was ever found, nor was any trace of any crash

In the early 1980s, my father worked as a flagman for a construction company in Long Neck, Delaware, USA. It was heavily overcast all day, but the sun occasionally peeked through the clouds. Dad looked up, enjoying the view, and noticed old World War II planes. They weren't just a few of the same type, but different types of planes from that era (B-17s, B-24s, B-25s, B-29s, Thunderbolts, Corsairs, Hellcats, and U.S. Army planes whose names he couldn't remember) flying over the sea at 2,000-3,000 feet, as if they were going to war. He even heard the engines, albeit faintly, but only when the clouds parted. When the clouds closed, he heard nothing.

The incident continued on and off for an hour. My father didn't think anything of it during that time. Dover Air Force Base wasn't far away, so it could have just been an air show, but there were no shows going on that day, and besides, few of these planes exist, certainly not as many as he saw (he got lost in the hundred, and more kept coming). My father recently finished reading a book about ghost planes, and it's been bothering him. No one at his workplace back then ever mentioned plane sightings, so he thinks he's losing his mind. (...) If anyone has seen anything like it here in Delaware or in any of the surrounding states, we'd both like to hear about it.