; (B) flight cancellations; and (C) disrupted or broken itineraries. (2) An estimate of any expenses incurred by passengers during significant computer network disruptions, including— (A) meals, lodging, and ancillary expenses per persons; (B) late hotel check-in or car rental fees; (C) missed cruise-ship departures; and (D) lost productivity. (3) Air carriers’ contracts of carriage and interline agreements to determine if and how air carriers accommodate passengers affected by significant computer network disruptions on other air carriers or foreign air carriers. (4) Whether passengers who have been displaced by significant computer network disruptions are furnished with alternative transportation aboard another air carrier or foreign air carrier. (5) Costs incurred by airports, if any, to meet the essential needs of passengers, including increased demands on utilities, food concessionaires, restroom facilities, and security staffing, during significant computer network disruptions. (6) Other costs, if any, incurred by passengers, airports, and other entities as a direct result of significant computer network disruptions. (7) Processes, plans, and redundancies in place at air carriers to respond to and recover from such network disruptions. 576. Tower marking Section 2110 of the FAA Extension, Safety, and Security Act of 2016 ( 49 U.S.C. 44718 note) is amended to read as follows: 2110. Tower marking (a) Application (1) In general Except as provided by paragraph (2), not later than 18 months after the date of enactment of the FAA Reauthorization Act of 2018 or the date of availability of the database developed by the Administrator pursuant to subsection (c), whichever is later, all covered towers shall be either— (A) clearly marked consistent with applicable guidance in the advisory circular of the FAA issued December 4, 2015 (AC 70/7460-IL)