Alaska Airlines is trying to reduce waste by asking passengers and staff to reduce the use of single-use plastics during flights.

The #FillBeforeYouFly hashtag initiative is meant to encourage people to bring their own water bottle and fill it before boarding. 

The airline sent a release Thursday saying this is one of many sustainability efforts to reduce in-flight waste going to landfills by 70% by 2020.

"We're passionate about working with our guests, employees, airports, and partners to reduce waste, protect habitats, and improve water health," said Diana Birkett Rakow, Alaska Airlines' vice president of external relations. "Land, water, and animals are incredibly special parts of the places we live and fly – and it takes many different company and individual actions together to protect them for the long term."

Birkett went on to say, "This is just one step. If just 10% of our guests bring their own pre-filled water bottle when they fly and choose reusables, it could save more than 700,000 plastic water bottles and four million plastic cups per year. That's a big lift."

Alaska Airlines is partnering with the Lonely Whale #HydrateLike hashtag campaign, which they say is popular on social media and inspiring individuals and companies alike to rethink reliance on single-use plastic bottles.

"The airline will plant a tree for every passenger who brings a pre-filled water bottle onto their flight and posts a photo to social media tagging @AlaskaAir with the hashtag #FillBeforeYouFly," the release says. "Alaska guests can help BEF achieve its goal of planting one million trees on the West Coast to improve the environment and restore habitats for local fish and wildlife."

Alaska Airlines is said to have a long track record of flying greener. According to the release, last year they became the first airline to replace single-use plastic stir straws and citrus picks with sustainable alternatives.

In 2010, the airline reduced per-passenger waste going to landfills by 65% and has more recently replaced bottled beer with aluminum cans.

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