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Many thanks for the prompt reply.

Should have dug deeper before I troubled you. Sorry for the inconvenience.

Follows is a part of a long post by ChatGPT on the question of why the big bird was down so long:

“I dug deeper, and the interesting finding is that there does not appear to have been a single grounding event. Instead, the airplane seems to have entered what became a multi-year, open-ended restoration and return-to-flight project.

What can be established from public sources is:

What we know for certain

The aircraft flew again on June 7, 2026 after approximately seven years out of the air. Reports from both aviation media and local observers consistently describe the effort as a restoration conducted by volunteers from the Vietnam War Flight Museum with support from the Collings Foundation.

The first post-restoration flight lasted about 35 minutes and included touch-and-go landings at Ellington Field in Houston. Aviation journalists characterized the flight as the culmination of “years of work” by volunteers.

The airplane is maintained by the Houston-based Collings Foundation volunteer group at Ellington Field, where the Foundation specifically notes that volunteers perform ongoing maintenance and restoration on the F-4D and several other Vietnam-era aircraft.

The strongest clues about why it took seven years

The best evidence comes from understanding what it takes to keep a civilian F-4 flying.

The Collings Foundation’s own history of the aircraft explains that even its earlier return to flight required:

• a major 600-hour inspection,
• replacement J79 engines,
• avionics upgrades,
• hydraulic-system overhauls,
• structural testing and repairs,
• sourcing ejection-seat components,
• and thousands of labor hours.

That description refers to the original 1990s restoration, but it reveals the scale of work involved whenever this aircraft undergoes a major maintenance cycle. An F-4 is vastly more complex than most civilian warbirds, and nearly all parts support infrastructure disappeared decades ago.

What enthusiasts close to the project have been saying

Local Houston aviation followers repeatedly described the aircraft as being worked on for six to seven years by the Vietnam War Flight Museum volunteers. One local commenter noted that volunteers had been trying to get it flying again for “the last 6–7 years,” which aligns with the restoration timeline reported elsewhere.

A plausible reconstruction

While I have not found an official statement listing every task performed between roughly 2019 and 2026, the available evidence suggests the grounding was probably a combination of:

Major scheduled inspection requirements on a 60-year-old supersonic fighter.
Engine and systems work involving the J79 turbojets and associated support equipment.
Hydraulic and fuel-system refurbishment, common on long-idle military jets.
Airframe inspections and structural repairs required before FAA approval.
Parts sourcing difficulties, especially for a type no longer supported by the U.S. military.
Volunteer manpower and funding limitations, since much of the work was performed by museum volunteers rather than a commercial restoration shop.
What I have not found

I found no evidence of:

• a crash,
• a runway incident,
• an engine failure that permanently grounded the jet,
FAA enforcement action,
• or any specific mechanical event that started the seven- year downtime.

That absence is notable. Aviation media covering the return-to-flight story almost certainly would have mentioned a major accident if one had been the cause.

Where the real answer may be hiding

The most promising sources are likely not news articles but:

• Vietnam War Flight Museum restoration updates,
• Collings Foundation volunteer newsletters,
• Facebook posts from the Houston restoration crew,
and YouTube videos documenting the work at Ellington.

Those often contain details like “replaced both J79s,” “rewired the rear cockpit,” “completed ejection-seat inspections,” etc., that never make it into press coverage.