It took two and a half hours for the LC-39 viewing for the TESS launch on April 16th to sell out. Tickets for Apollo/Saturn V Center remain available.
Welcome to the post-Falcon Heavy world.
Update: LC-39 Observation Gantry tickets are sold out. Apollo/Saturn V Center tickets are still available. https://t.co/eaABZaYLpT
— Kennedy Space Center Visitor Complex (@ExploreSpaceKSC) April 5, 2018