Millions of cups of coffee were drunk on the plane. How did the airline choose coffee?

United offers 197261 cups of coffee a day on all routes around the world; Delta offers Starbucks coffee on 5000 flights around the world; Qantas offers 25000 cups of coffee a day on flights around the world. KLM offers 18.55 million cups of coffee a year on global routes. At an altitude of 30,000 feet that we didn't notice, so was coffee.