Ask the airline how it will get you to the original destination or another agreed point. Keep the replacement airport, transport offer and receipts.
Advertisement
What to check
Check whether the flights were on one ticket, what the airline offered, and whether you agreed to give up a seat or take a new flight. Small differences in those facts can change the claim path.
Advertisement
What to do next
Contact the operating airline while the remaining itinerary can still be changed. Keep a copy of its offer and your response.
Advertisement
Official sources
Advertisement
Your route and travel date may change the answer. Check the linked official rule.