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My mother is shortly about to be doing the longest traveling she has ever done and is exceptionally worried because she is doing it solo.

She is traveling to San Jose, Costa Rica from Dublin, Ireland with Delta airlines.

Her first leg is Dublin to Atlanta then to San Jose. On returning, she has San Jose to Atlanta then to Boston and finally to Dublin.

I thought because she is only transiting through the US,she would not need a Visa but now I am under the impression she will require an ESTA?

Furthermore, when getting connecting flights in the US, will she be required to actually leave the airport and find departures every time she lands in a US airport? Or are there signs within the listed airports for connecting flights?

TomSelleck
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Provided she meets the requirements for the Visa Waiver Program, she does not need a Visa to transit the United States.

She should clear US Immigration and Customs at the CBP Pre-Clearance facility at Dublin.

In Atlanta, she will arrive at a domestic gate. She will probably have to ride the train to a different concourse though.

On the return, she will have to clear US CBP and TSA again in Atlanta. Then almost certainly another train ride to the concourse where the Boston flight departs.

Delta at Boston is spread across two terminal buildings. While they are both airside, the walk can be long.

DTRT
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