Update on Jan, 15th:

United Airlines has released a statement following the circulation of a tweet that showed Apple as its largest account, spending $150 million on flights every single year.

In a statement to Kif Leswing, United Airlines said that the information was displayed as part of an (intended to be) private project that has since been discontinued.

Big companies don’t like details like this being public knowledge, even if there isn’t anything too sensational about a big corporation buying a lot of flights for its employees.

United Airlines comment on the Apple sign pic.twitter.com/7njURPxz3j

— kif (@kifleswing) January 14, 2019

A pair of promotional banners created by United Airlines to tout its various business relationships with big-name companies reveals a sneak peek into Apple's global operations, with the tech giant reportedly spending some $150 million each year on flights for employees.

The signage, spotted by LAFlyer, is on display at United's terminal in the San Francisco International Airport, the jumping off point for many Apple-purchased flights. SFO serves residents and scores of tech companies operating in the Bay Area and is less than an hour's drive from both Apple's One Infinite Loop and Apple Park headquarters. 

Generating $150 million in yearly revenue, Apple represents United's largest global account. Others on the list, including Facebook, Roche and Google, are credited as contributing "over $34 million" a year in revenue to United's bottom line. 

Interestingly, the airline goes into specifics regarding Apple's movements, noting Shanghai as the company's most important market. More pointedly, Apple spends $35 million on flights from San Francisco to Shanghai Pudong International Airport — an average of 50 business class seats daily — representing a quarter of its annual spend with United.

Shanghai acts as a major hub for scores of regional airports in China, many of which are located near Apple's numerous partner suppliers across the country. 

Outside of Shanghai, Apple's top-ten destinations include Hong Kong, Taipei, London, South Korea, Singapore, Munich, Tokyo, Beijing and Israel, respectively. As can be expected, Apple owns office space or deals with suppliers based in each of those locations. 

Though the promotional material is designed to goose confidence in United's business, it also provides valuable insight into Apple's behind-the-scenes operations that go beyond information found in quarterly earnings reports and other public disclosures. 

It should be noted that the statistics offered by United relate mainly to San Francisco operations. Thousands of Apple employees are stationed at other U.S. campuses, like facilities in Texas and North Carolina, and likely rely on United for their business travel needs.

Source: appleinsider