There are no international rules for using a car seat in an airplane. If the baby is 0 to 13 months, a car seat can make air travel easier and safer. The Maxi-Cosi Citi SPS and Maxi-Cosi Pebble have been legally approved for aircraft use, in accordance with the guidelines of the German TüV certification agency. This can be seen by the TüV approval sticker on the side of the product. In all cases, the airline must be informed about any use of a car seat on a plane. Ask your travel agency or airline when booking your tickets about the rules and possibilities. The Maxi-Cosi Citi SPS or Maxi-Cosi Pebble must be installed in a rear-facing position, just as in a car, only using the lap belt in the airline seat. The belt must be threaded through the blue belt hooks and secured tightly. If you have any specific installation questions, consult the cabin crew, since every aircraft has a different seat layout.