Passengers can do their part by making conscientious decisions before and during flights. For example, planes guzzle fuel during takeoff and landing, so book a nonstop flight. Bonus points for choosing a sustainable airport, such as Seattle-Tacoma International or Chicago O’Hare. Support airlines that are ditching single-use plastic, such as Air France and Alaska Airlines, which serve Boxed Water. Contribute to the carrier’s carbon offset program. American Airlines, for instance, has partnered with Cool Effect, which uses the proceeds to fund environmental projects in Mexico, Indonesia and Honduras. Also, reduce your airtime by remaining in one location for a longer period.