Plans for a third Heathrow runway will be with the government "by summer", the airport has said, amid projections it could be decades before the project is completed, if at all.
The dinner on Wednesday comes after Downing Street denied involving the monarch in politics after he appeared alongside the prime minister and Angela Rayner at a housing project in Cornwall.
The incident has caused travel disruption, with some commuters reportedly taking three hours to get to work on Tuesday.
A signatory of the Drumlanrig Accords described them as representing "a bold first step towards rebuilding a meaningful trust ...