What type of emergency equipment is typically found on United Airlines flights?

The correct answer highlights essential safety equipment found on United Airlines flights, specifically oxygen masks and fire extinguishers. Oxygen masks are critical for use in the event of cabin depressurization, providing passengers with a supply of oxygen to ensure their safety until the situation is resolved. Fire extinguishers are also vital emergency tools, allowing crew members to quickly address any onboard fire incidents to protect passengers and the aircraft.

In contrast, available entertainment systems, extra seating arrangements, and personal item storage compartments focus primarily on passenger comfort and convenience rather than safety. While these features enhance the travel experience, they do not serve the immediate safety needs that emergency equipment like oxygen masks and fire extinguishers address.