Establish additional partnerships with other airlines on specific routes to, for example, consolidate two half-full flights into one fully-booked flight.

Offer pre-filled reusable water bottles and collect them in before landing

Sometimes we don't need the cream and toothbrush; sometimes a pair of socks is sufficient. Being able to customize the amenity kits in advance reduces waste.

Create an ability to share a seat in your car with other passengers on the flight. It's better than everyone riding their car.

Let people on the plane as they are seated, start with A and F, then B and E, and then C and D at last.

Waste reduction challenge: Launch an in-flight competition where the flight producing the least waste per passenger wins a sustainability award