A Boeing Co. 737 jetliner routed to Tijuana, Mexico suffered significant damage to its nose shortly before landing this week, and some airline experts believe it was caused by a drone. While crew members didn’t see anything, they did, predictably, hear a “pretty loud bang,” which prompted them to ask the control tower to check if the nose was damaged. In a 2017 study based on computerized models, the FAA concluded that drones would cause more damage than birds of a similar size because they contain metal parts. Significant damage to windshields, wings and tail surfaces of aircraft was possible, the study found. However, the damage a small consumer drone could cause was unlikely to prove catastrophic, the study found.