The wait for commercial flights into space continues after Virgin Galactic on Tuesday announced its plans to begin preregistration for a second wave of ticket sales.

Spaceport America CEO Dan Hicks said in November that flights are projected to launch this summer. With that countdown quickly approaching, Virgin Galactic Holdings Inc. said in a news release it intends to reopen ticket sales after freezing them in 2018.

Starting Wednesday, those interested in making the sojourn to space can pay a $1,000 refundable registration fee to queue up for actual ticket sales. The company has not yet announced when they will go on sale, or how much they’ll cost.