How does the airline choose coffee? Millions of cups of coffee are drunk at 30,000 feet every day.

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United buys 1.4 million pounds of coffee a year, makes 72 million cups of coffee, and serves 197261 cups of coffee daily on all routes worldwide.

Delta serves Starbucks coffee daily on 5000 flights worldwide.

Qantas serves 25000 cups of coffee daily on flights around the world.

KLM provides 18.55 million cups of coffee on its global routes every year.

Coffee is also big business at 30,000 feet, where we don't notice it. Dripped Coffee, a coffee maker provider, offers a list of 44 airline coffee providers in 22 countries around the world to let consumers know that high-quality coffee has flown high and is well worth looking forward to.

The preferred choice for sourcing local coffee brands is, from this point on, Starbucks for US airlines, Kenco for UK airlines, Nestle for Swiss airlines, and Delta coffee for Portugal airlines.

But for airlines that offer high-end flight experiences, coffee choices are also about taste, so United Airlines blindly tested 17 coffees to find the one that works best at 30,000 feet.

"We know how important coffee is to coffee lovers. These taste tests helped us determine the best way to improve both in-flight and club coffee. It's not just a cup of coffee, it's an important part of our customers 'daily lives and the overall experience they get at United." said Jeff Pelch, United's food service employee.

United eventually opted to serve illy italian coffee, and passengers on test flights said,"a cup of coffee on an early flight makes my day more productive."

The importance airlines place on coffee also depends on whether the country has a strong coffee culture. British airlines, which have a better tea culture, prefer instant coffee, while Turkish Airlines, which has a unique taste for coffee, directly carries Turkish traditional brewed coffee on board. In addition to international chain brands, some airlines choose local brands with better reputation and flavor, such as Hawaiian coffee for Hawaiian Airlines and JAL Café Lines for its own coffee brand.

Flight altitude, cabin humidity and other reasons may lead to coffee taste changes, but in general, the airline's choice of coffee category also reflects the local coffee habits, such as Canada, the United States provide large cups of coffee, while Arab, Western European and Central European countries airlines are mainly Nespresso and illy espresso.