Airline guidelines are rules and regulations set by airlines to ensure the safety and comfort of passengers during their flights. These guidelines cover various aspects, such as baggage limits, check-in procedures, and security measures. For example, most airlines allow a specific weight for carry-on luggage and require passengers to arrive at the airport a few hours before their flight. Additionally, airline guidelines also include policies on in-flight behavior, such as the use of electronic devices and the consumption of alcohol. Understanding these rules helps travelers have a smoother experience and avoid any unexpected issues while flying.