Stop serving food/snacks/drinks on the shortest flights and instead implement grab and go lounges. Saves weight and can give customers greater choice.

Let the customer choose different carbon off-sets upon purchase of tickets. It can also include options that boost great projects.

Mount small blades on the side of the wheels to make them spin by themselves before landing to reduce tyre wear upon contact with tarmac.

Offer rebate to business class passengers for not using the full luggage quota.

In Plus and Business on long haul - hand out amenity kits by request instead of placing them on all seats.

Develop incentive programs for staff to contribute ideas on reducing emissions. Make staff applicable for perks by doing "missions".