[Your address]
[Company address]
Dear Sir/Madam
Ref: Lost Luggage
Flight: [insert flight number]
I flew with your airline on [date] between [departure airport] and [arrival airport].
My checked in luggage did not arrive at my destination and has now been missing for 21 days.
Under the Montreal Convention I would like to claim [£xx] compensation for my lost luggage.
I enclose copies of my receipts for replacement items.
Yours sincerely,
[your name]