Yes, travelers to the United States who are eligible for the Visa Waiver Program (VWP) and have obtained an Electronic System for Travel Authorization (ESTA) approval are required to provide their airline with proof of ESTA authorization before boarding their flight to the US. The ESTA approval is an online pre-screening process that determines the eligibility of travelers to visit the US for tourism, business, or transit purposes without a visa.

When checking in for their flight, travelers are typically asked to present their passport and proof of ESTA authorization. This can be in the form of a printed ESTA approval confirmation or an electronic record linked to their passport. The airline staff will verify the ESTA approval before allowing the traveler to board the flight bound for the US.

It’s important to note that an approved ESTA does not guarantee entry into the US, as the final decision rests with the US Customs and Border Protection (CBP) officer at the port of entry. However, having a valid ESTA approval is a prerequisite for boarding a flight to the US under the VWP.