In your private email to me (why?) you indicated you all checked your luggage the same way with Northwest but only some of you received the luggage onboard. Without having picked up your own luggage on arrival , how do you know that it was not in fact Northwest that lost your luggage? Perhaps Celebrity remains correct. How do you know the luggage ever made it to your destination? That said airlines compensate virtually nothing if they eventually find your luggage. If somehow you were to prove (how/) Celebrity failed to pick up the luggage then perhaps a hundred dollars (or maybe $ 200) per person for temporary clothes would be an appropriate request. If you used a TA they are your best advocate for results.