Shares of the company fell nearly 2% in extended trading.

"We look forward to returning to space in the fourth quarter and launching commercial service in the first quarter of next year," Chief Executive Officer Michael Colglazier said.

The Richard Branson-founded company had earlier planned to launch the commercial space flight service in the fourth quarter of 2022.

A handful of companies including Elon Musk's SpaceX and Jeff Bezos' Blue Origin are striving to make space tourism a reality, and some have already launched civilian missions.

Virgin Galactic's net loss stood at $93.1 million during the first quarter ended March 31, compared to a loss of $129.7 million, a year ago.

(Reporting by Tiyashi Datta in Bengaluru; Editing by Shailesh Kuber)