Yes, an airline can block or "ban" a passenger for a variety of reasons, ranging from unruly behavior to fraudulent activity. In 2026, global aviation regulators like the FAA and DGCA have reinforced "Zero Tolerance" policies. You can be banned for physical or verbal harassment of crew, smoking on board, or attempting to breach the cockpit. For these offenses, you may be placed on a "No-Fly List" for anywhere from three months to a lifetime. However, airlines also "block" passengers for "non-safety" reasons, such as "Hidden City Ticketing" (skipping a leg of your flight to save money) or excessive chargebacks on credit cards. If an airline deems you a commercial liability, they can exercise their "Right to Refuse Carriage" found in their Contract of Carriage. Once blocked, your profile is flagged in their system, preventing you from booking future tickets or even using their affiliated partner airlines within the same alliance (like Star Alliance or oneworld).