Czech Airlines generally recommends that passengers arrive at the airport at least two hours before the scheduled departure time for international flights. For domestic flights, arriving one and a half hours in advance is usually sufficient. This allows ample time for check-in, security screening, and any other necessary procedures before boarding. However, during peak travel periods or busy times, it may be prudent to allow additional time to account for longer lines or potential delays. It is also beneficial to verify the specific guidelines and advice provided by Czech Airlines on their official website as procedures or recommendations may vary based on the airport or specific flight circumstances. Planning ahead can significantly enhance the overall travel experience.