united airlines pay for expenses from delayed baggage

if your luggage hasn't shown up with your flight, you'll need to file a claim with united airline at the airport. If your bags are delayed, united airlines usually agree to pay "reasonable" expenses until the luggage is found.

united airlines Interim expense claim

If your baggage has been delayed and you must make interim purchases, please ask united airlines baggage representatives at 1-800-221-6903 to explain our guidelines. If away from home, United may consider reimbursement of up to 100% on rental items and 50% for purchased necessities, taking into account your ability to use the new items in the future.
If your bags do not arrive at your destination, report this to the United baggage agents in the claim area/office before you leave the airport. It is important to do so as soon as possible so we may obtain information pertinent to locating your luggage. Please note that all lost, damaged or delayed property must be reported to United within 24 hours.
If your bag has been located and returned to you, and you still wish to request reimbursement of related expenses, send your request in writing, within 45 days of the occurrence, to the following address. Please include a copy of your ticket receipt, any baggage claim checks, a copy of your delayed baggage report, and any itemized purchase receipts pertinent to your claim.

United Airlines
Central Baggage Services - HDQLZ
P.O. Box 66140
Chicago, IL 60666-0140

If you have received your bag and there are items missing or damaged from it, you must report the missing property immediately to a United representative or, no later than 24 hours from receipt of baggage.For bags lost or damaged on flights within the U.S., a liability limit of $3,300 applies. On international trips, the liability limit may vary, as it is governed by various international treaties, including the Montreal and Warsaw Conventions. As of August 2011, if you pay a baggage fee and your bag is lost, the airline must refund your fee as well.