What is a feature of the ETA linked to?

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The Electronic Travel Authorization (ETA) is specifically linked to the passenger's passport. This reflects the understanding that the ETA serves as a travel document allowing individuals from specific countries to enter a host nation without a visa, and all identification and authorization processes are tracked under the unique identification number of the passport. Essentially, the ETA is electronically associated with the passport, enabling authorities to link travelers' entries and exits in their border control systems.

The relationship to the passport is crucial because it ensures that the authorization is tied to a particular individual’s identity and travel history, facilitating smoother processing at immigration checkpoints. The connection to a passport also helps verify that the individual holding the ETA is the same person who applied for it, aiding in security and management of travel entries.