If you can show that the airline did not do one or more of the above, a court may permit you to recover more than the limit. On the other hand, a court might decide that the airline's failure to follow the Warsaw Convention procedures is merely technical and doesn't permit you to recover more than the limit. For example, if an airline fails to weigh your bags, the court may rule that the airline is required merely to pay you as though the bags weighed 70 pounds, the maximum allowable baggage per customer. That is, when you check your baggage in, declare the estimated value of the baggage and its contents. The airline will then be liable for the entire declared amount if the baggage is lost or damaged, unless the airline can prove that the value was actually less than what you declared.
Airlines can and do place limitations on the number and size of carry-on bags.
Most airlines permit two carry-on bags per passenger, and at least one of the bags must be small enough to fit under the seat in front of you. Airlines are tightening restrictions on carry-on baggage. Many now limit economy class passengers to one carry-on bag in addition to a briefcase or purse. These restrictions make it even more important to plan ahead, and make sure you can keep medicines, jewelry and other items of value with you, and not in a bag that might have to be checked. If the flight is not full, the airline may be more lenient, but don't count on it.