Can you travel individually to the United States on a group ESTA?

My significant other and I travelled to the USA in late 2015. We made a group ESTA application and it was approved and we went on holiday.

I'm travelling to the States in a week on my own this time, and I'm wondering if I can use the ESTA reference, or if it will be met with confusion as I will be travelling on my own?

Is the group application purely a convenience to register multiple ESTAs (so I'll be fine), or is the group application somehow binding that I have to be travelling in that group for it to be valid (so I'll need my own, individual one)?

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Can an individual travel on a group ESTA?

The official ESTA application website of U.S. Customs and Border Protection (CBP) accepts ESTA applications for not only individual traveler but also groups and families traveling together.

How does a group ESTA work?

The group application enables all members to receive their ESTA authorisation at the same time. The validity period of these travel authorisations is therefore the same for them all and the whole family can enjoy further future visits together.

Is US ESTA multiple entry?

Your ESTA authorization is generally valid for multiple trips over a period of two years (starting the date that you are approved) or until your passport expires, whichever comes first. As long as you received an ESTA authorization to travel, you do not have to reapply during the validity period.

Do I need a new ESTA for each trip to the US?

There is no need whatsoever to update your ESTA each time you go to the USA within the two year period it lasts for. It even says this on the application form. The address of your new accommodation will be collected in the Advance Passenger Information everyone has to supply to the airline before travel to the USA.

ESTA for a family or group of travelers

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Kendall Hoopes, Quintin Gellar, Roberto Lee Cortes, Akira Deng