If airlines go on strike and your flight is cancelled, this shouldn’t affect your
ESTA application. Once your ESTA is approved it remains valid for 2 years or until your
passport expires, this depends on which one comes first. However, if your planned travel
date is in the last days before your ESTA expires and your flight gets cancelled, you will
need to apply for your ESTA again, if your current one will not cover your rescheduled flight.
Even though this would be a matter beyond your control, you are required to apply for your
ESTA again and pay the fee to submit a new ESTA application.
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