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https://community.expensify.com/discussion/34645/844-278-1109-does-etihad-have-a-24-hour-cancellation-policy/p1?new=1

Yes, Etihad also have cancellation policy, specially for 24 hour ticket cancellations. Etihad Allows its passenger to cancel a flight for
free before 24 hours of flight departure. Etihad Airlines'
cancellation policy allows passengers to cancel their flights within 24
hours of booking for a full refund, provided the flight is booked at
least seven days before departure. Beyond the 24-hour window, cancellation fees may apply depending on the fare type. Basic Economy tickets are non-refundable.