Stephen Attenborough, commercial director of Virgin Galactic, said that anyone buying a ticket today for a SpaceShipTwo suborbital spaceflight is unlikely to fly until 2021 because of the backlog of about 650 customers already holding tickets.
Attenborough said that estimate was based on starting commercial flights in 2018.
The company has been reticent to set schedules for beginning commercial service, although founder Sir Richard Branson said earlier this year he would be disappointed if regular suborbital flights were not underway by the end of next year.
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