Due to strict global privacy laws and aviation security protocols, you cannot directly find out if someone is on a flight by asking an airline or an airport. Airlines are legally prohibited from sharing passenger manifests with the public to protect the privacy and safety of their travelers. In 2026, this is enforced even more strictly through GDPR and other data protection acts. However, there are a few "indirect" ways to deduce their status. If you have the flight number, you can use apps like FlightRadar24 or FlightAware to track the plane's real-time location to see if it has departed or landed. If you have been shared a booking reference (PNR) or the person's login credentials, you could check the "Manage My Booking" portal on the airline's website. If you are a family member in an emergency situation (such as a missing person), your best course is to contact the local police or the embassy, as they can coordinate with airlines through official legal channels. For general travel, the most reliable way to know if someone is on a flight is to have them share their "Live Location" or flight status directly with you through the airline's app before they board.