| The Oceania Insignia sailing in China. The cruise line said its 2023 world cruise aboard the ship is already sold out. It is not surprising, given the uncertainty created by serial delays in cruise relaunch dates, that guests are booking their sailings further and further out as a hedge against their departure being canceled. But even given these circumstances, ocean and river lines are seeing their booking curves move way beyond what would be expected, and they are opening their books further out than ever in response. According to a report from Truist Securities, as of March, the cruise booking window was at a record length, with a 365-day average versus 210 days one year ago.