On Wednesday, Delta Airlines flight 9771 flew from Atlanta to Pinal Airpark in Arizona. It wasn’t a full flight—just 48 people on board. But it was a milestone—and not just for the two people who got married mid-flight—for it marked the very last flight of a Boeing 747 being operated by a US airline. Delta’s last scheduled passenger service with the jumbo was actually late in December, at which point it conducted a farewell tour and then some charter flights. But as of today, after 51 long years in service, if you want to ride a 747 you’ll need to be traveling abroad.