Digital travel credentials are a traveller's identity, checked once and stored in digital form, so that it can be shown at the airport, the airline and the border without paper documents. The idea is to check the passenger's identity once, carefully, and then reuse that check at every later step. ICAO, the United Nations agency for civil aviation, sets the international standard for passports. Its version is called a Digital Travel Credential.
Today a passenger shows the same documents many times on one journey: at the airport entrance, at check-in, at security, at the boarding gate and at immigration. Each time, a person compares the document with the face. Digital travel credentials replace these repeated checks with a face scan, matched against an identity that has already been verified.
India already uses this idea for domestic flights, through DigiYatra. Imagine a doctor in Varanasi flying to Mumbai. A week earlier, she installed the DigiYatra app. The app verified her identity with her Aadhaar through DigiLocker, the government's document app, and it took a selfie. This is identity verification, the same kind of check used in KYC. Her verified identity is stored on her phone, not in a central database. When she adds her boarding pass, the app shares her face data and her flight details with Varanasi airport. At the entrance gate, a camera scans her face. The system matches it with the shared record and with her boarding pass, and the gate opens within a few seconds. She passes the security check and the boarding gate in the same way. The airport deletes her data within about a day of the flight.
For international journeys, the credential is built from the chip in the passport. The traveller's phone reads the chip and compares its photo with a selfie. The credential is then sent to the airline and to the destination country before the trip. The airline's passenger service system can then accept the passenger without a manual document check. Its departure control system records the boarding.
Digital travel credentials raise real questions about privacy. Who stores the face data, for how long, and who may use it for other purposes? DigiYatra is voluntary, and passengers can still show a paper ID instead. Governments are building these systems faster than the travel industry is. DigiYatra builds on India's digital public infrastructure, which also includes Aadhaar and UPI.