Non ne so niente di specifico ma le condizioni del contratto di trasporto di Oman Air recitano:
9.2.2. Except as otherwise provided by the Convention, applicable EU law or domestic law, if we cancel a flight, fail to stop at your destination or Stopover destination, or cause you to miss a connecting flight on which you hold a confirmed reservation, we shall, at your option, either:
9.2.2.1. Carry you at the earliest opportunity on another of our schedule services on which space is available without additional charge and, where necessary, extend the validity of your Ticket; or
9.2.2.2. Within a reasonable period of time re-route you to the destination shown on your Ticket by our own services or those of another carrier, or by other mutually agreed means and class or transportation without additional charge. If the fare and charges for the rev ised routing are lower than what you have paid, we shall refund the difference; or
9.2.2.3. Make a refund in accordance with the provisions of Article 10.2.
Fonte:
https://www.omanair.com/en/legal/conditions-of-carriage#Schedules
Dunque scegli tu. Poi se il volo successivo ha un PNR diverso, è chiaro che non ti coprono.