Yes, civilians can fly standby, but the process has evolved significantly since the early days of aviation. There are two main types of civilian standby: "Same-Day Standby" for confirmed ticket holders and "Non-Revenue Standby" for airline employees and their designated "buddy pass" holders. Most major airlines allow standard ticketed passengers to go on standby for an earlier flight on their day of travel, often for a fee (though it is increasingly free for elite frequent flyers). To do this, you typically request to be added to the list via the airline's app or at the airport kiosk. The airline will only clear the standby list a few minutes before the plane doors close, once they are certain there are empty seats. It is a game of patience and luck; if the flight is overbooked, standby passengers are the first to be left behind. Civilians without a pre-purchased ticket can no longer simply show up and buy a "standby" fare as they once could in the 1970s due to modern security and revenue management.