The 12 staff who have resigned made up the firm's entire workforce
The entire management team at an airline which claimed it would resume commercial flights between Durham Tees Valley Airport and London has resigned.
In a statement, the 12 staff said owner Victor Bassey had never paid them, and had failed to provide capital funding for the company or its creditors.
Mr Bassey has declined to comment on the matter.
Cleveland Police said they were investigating a complaint of fraud against the firm.
In July, Excelsis said it planned to create several hundred jobs flying to London City Airport.
The claim raised hopes that Durham Tees Valley airport could resume services to the capital, which were lost in February when bmi axed its Heathrow route.
A spokesman for the airport said: "In the case of Excelsis Airways airport representatives did have initial meetings with Mr Victor Bassey.
"Following the announcement by Excelsis of the appointment of a senior management team it was hoped to have further discussions but arrangements for meetings were cancelled by Excelsis."
The 12 staff who have resigned from the airline are understood to have made up its entire workforce.