What is a recommended action to help treat air sickness?

Loosening tight clothing is a recommended action to help treat air sickness as it can enhance comfort and improve circulation, potentially alleviating some symptoms associated with motion sickness. When clothing is tight, it can physically restrict movement, increase discomfort, and contribute to feelings of nausea. By relieving this restriction, the passenger may feel more relaxed, which can help reduce the severity of air sickness.

While laying the passenger flat might seem beneficial for some situations, it can actually counteract the effects of gravity, which may exacerbate feelings of nausea for certain individuals. Giving the passenger water is generally a good idea for hydration, but it might not directly address the nausea itself and can lead to discomfort if consumed too quickly. Administering medication immediately may not be appropriate without knowing the passenger's medical history or any potential allergies, and passengers may be hesitant or unable to take medication during a flight. Therefore, loosening their clothing is a practical and safe first step in managing air sickness.