Airline guidelines typically include rules and regulations related to baggage allowances, check-in procedures, security measures, onboard behavior, and ticketing policies. Passengers are usually required to adhere to specific weight and size limits for both carry-on and checked baggage. Check-in times, identification requirements, and boarding procedures are also outlined. Additionally, guidelines cover prohibited items, electronic device usage, and safety instructions during the flight. It is important for passengers to familiarize themselves with the airline's guidelines to ensure a smooth travel experience.