Porter Airlines has grounded flights for another month.
The company was hoping to resume service on November 12 but has extended the shutdown until December 15.
The decision is due to continuing COVID-19 travel restrictions.
President and CEO Michael Deluce says the flare-up of cases in certain markets during the last month dampened any expectation of changes to government restrictions.
He says they hope lifting travel restrictions will soon be possible given evolving technology, such as rapid testing, and health and safety investments the travel industry is making.
The company is waiving change and cancellation fees on all fares booked through December 15.
Porter flights were halted across the country on March 21.