What puzzles me is that if the object was described as blimp-shaped, and a Goodyear blimp was in fact based in Akron (there's a hangar there), why did no-one check the flight records at the time?
https://www.nps.gov/articles/goodyear-airdock.htm
This page has a picture showing blimps at Akron in 1973.
Thank you for the most helpful replies.
This 1973 photograph might be misleading and I believe shows two airships which have long been retired from service. Neither appear to be the Goodyear Mayflower airship.
The Akron airdock had been mothballed for some five years and my understanding is that only the hangers were now in use, as storage facilities.
Goodyear's Mayflower was now based in Miami and quoting 'The Miami Herald', on 6 April, 1973:
"The five- year-old Mayflower has reached the end of the road. Its being put in the hangar in mid-April for maintenance work just before making its last rounds here. On May 4 the blimp will leave on a six months summer tour of the north and will return to Miami in October to stay on until a replacement arrives to take over. The Mayflower will return to Akron then but Pingree doesn't know its ultimate fate".
On 1 October, 1973, the Mayflower flew from Grosse Ile Naval Base, situated adjacent to Lake Erie, in order to film the Detroit Lions v Atlanta Falcons Monday night game.
I have also verified that on October 27th, it filmed the Notre Dame v University of Southern California (USC), college football game, at Notre Dame, Indiana.
Where though, was it located inbetween and could it be placed relatively local and closer to the date of our helicopter and 'UFO' encounter on 18 October, 1973, near Mansfield, Ohio.
Conversely, was it possible to determine the Mayflower had categorically been nowhere near Mansfield that particular night.
Whether searching for either 'airship', 'blimp', or Mayflower, there seemed to be no related information in any of the, now comprehensive, subscription newspaper archives.
Nothing was showing up elsewhere, either.
There were several UFO reports from around the Mansfield, Galion and Belleville area in the days before and after our 18 October incident, including some from Galion, earlier on the same night.
I wondered if the Cleveland Browns have been playing at home around that timeframe and might the Mayflower blimp, have been scheduled to film this game.
Indeed, on 15 October, the televised Monday Night Football was Cleveland Browns v Miami Dolphins, in Cleveland.
However, there was no documentation to be found, confirming Goodyear's Mayflower blimp had been present.
A final thought and last resort... was there any archive film of the game available and if so, perhaps an outside chance the blimp would be featured
We do have a highlights reel on YouTube and at 05:05, this happens:
Commentator: There's your moon over Cleveland and up in that area close, is our Goodyear blimp. It could be one of your unidentified flying objects. There's a lot of them going around... especially in Mississippi.
Co-commentator: They spotted a few around here, last night.
Commentator: It's good to have the Mayflower with us though...
(End of extract)
Without specific data, it is obviously impossible to pinpoint exactly where the Mayflower was on the night of 18th October.
Was it actually perhaps en route, to or from, the nearby Goodyear blimp facility at Wingfoot Lake/Akron, Ohio...
Unless returning from an engagement, why flying so late at night - the Coyne encounter is timed at 23:05.
From other articles, outwith October, it seems that when visiting each scheduled location, the practice was for Goodyear's airship to stay for one or more nights at a local airport and then move on to its next booking.
To progress any further, we obviously need to pinpoint its precise location on Thursday 18 October.
The only sports event I can find for that night - apparently no major or college football games - is a World Series baseball game in New York and doesn't seem to be any evidence of this being filmed from a blimp.
Will come back to your other excellent points, separately.