Southwest will temporarily offer free WiFi to some of its passengers as a part of its attempt to test its new service upgrades.

The free WiFi will begin on Wednesday until June 10 and will be available on flights flying in the western United States. Southwest added the upgraded WiFi hardware to 40 of its Boeing 737s, according to a memo sent to employees on Tuesday from Tony Roach, the vice president of customer experience and customer relations, CNBC News reported.

“This trial will allow Customers to stream, browse, and engage on the internet at no cost just like other complementary services,” Roach wrote.

“Our goal is to evaluate how the new hardware improves performance while delivering a reliable internet experience used by a large volume of customers," he added.

The updated WiFi hardware is meant to have faster internet connectivity onboard overall compared to other WiFi options available on planes, Southwest explained. It also accounts for the latest effort from an airline company to improve internet options for passengers.

Internet service onboard gets complicated because anyone connected to the WiFi is splitting a tiny amount of bandwidth coming from towers on the ground.

Southwest has previously offered WiFi services for $8, according to its website.