I have bought a flight ticket
If you owe more money because of a delayed or cancelled flight that is not covered in the above-mentioned regulation, you can receive compensation according to the Montreal convention.
If your luggage is delayed, lost, or damaged you have under some conditions the right to compensation according to the Montreal convention.
Read more in the article Airline travel
Write a letter to the airline company presenting your case or use the complaint letter that the EU Commissioner has created: EU Complaint form (PDF in English), which you will find on the right side of this page.