The inquiry into Coventry airport was adjourned yesterday afternoon so plan-ners could measure the runway amid claims that it is 40 metres too long.
Resident groups claimed documents produced by the airport - now called West Midlands International Airport (WMIA) - had changed the official length from 1,825 to 1,865 metres.
Although not officially part of the inquiry, which is looking into plans for a permanent terminal at the Bagintonbased airport, planning inspector Neil Roberts organised an inspection.
The runway was subsequently found to be 1,865 metres long and Mr Roberts - along with representative from the Civil Aviation Authority (CAA), Warwick District Council and community groups - found no sign of an extension.
Mr Roberts will comment further on the matter when the inquiry resumes today.
But Leek Wootton resident Martin Clive Smith, who wrote to the inquiry about the runway length, said residents would continue to campaign against WMIA's extension on safety grounds.
He said the length of the stopping area at the end of the runway near to Tollbar End was of grave concern.
"The site inspection found the Runway End Safety Area to be 90-metres long," Mr Smith said.
"This is a legal minimum in this country. The CAA recommends it should be 240 metres and other organisations suggest it should be over 300 metres.
"This is not the sort of thing we should be promoting in an modern international airport, especially when we have airports like Birmingham with runway safety lengths."
Mr Smith said he was concerned that the public were uninformed of potential risks of a shorter safety area.
"This is a public inquiry and I think the public should know what the chances are that they could by squashed by an over-running aeroplane." he said.
"The terminal extension is a dodo of a project, they are trying to fit a pint into a half-pint pot. It should not go ahead."
WMIA hopes to build a permanent terminal capable of handling up to two million passengers a year.
But the plans have been opposed by resident groups and Birmingham International Airport (BIA), which fears it will interfere with its airspace and hinder its own plans for a second runway.
During the inquiry's morning proceedings John Steel, QC, for BIA and Peter Village, QC, for WMIA continued to question Philip Roberts, assistant director of airspace for the CAA's Directorate of Airspace Policy, on the impact of the extension.
Mr Roberts has submitted a report to the inquiry based on flight models produced by both airports.
He warned that although the airspace in the region could accommodate WMIA's expansion, both airports would have flight delays.
He suggested several measures that could reduce this including combining WMIA and BIA's take-off and landing operations, reducing take-off distance between planes and reducing the levelling height for planes taking off from Coventry.
The latter is of particular concern to resident groups who claim the 2,000-feet above sea level option suggested by Mr Roberts would be just over 1,700 feet above Baginton.