- The flight search engine Skiplagged is seeking a judgment on whether it violated Southwest's terms.
- The lawsuit came after Southwest sued Kiwi.com, another flight-info site, in Texas.
- The airline sent letters threatening legal action over fare listings, Skiplagged's complaint said.
Skiplagged, a flight-information website, has asked a New York court to rule on whether it was breaking Southwest Airlines' terms of service by posting airfares.
The lawsuit said flights displayed on Skiplagged aren't pulled directly from the airline's website so they didn't break the website's terms.
"Skiplagged does not access Southwest.com or use the Southwest API to obtain data published on Skiplagged.com," the tech company said in its complaint, "and is not bound by the Southwest terms and conditions."
The filing was an indirect response to another lawsuit in which Southwest was suing a different flight-data provider, Kiwi.com. Skiplagged wasn't named as a defendant in that case, but the outcome could affect its business.
Southwest has been in a legal battle with Kiwi.com in federal court in Texas since January. Southwest in that lawsuit sought an injunction to stop Kiwi.com from displaying its flights. The airline has stated that it doesn't allow online travel agencies to sell its flights without written permission.
"Kiwi knowingly and intentionally targets the Southwest website to harvest Southwest's fare and pricing information for its own commercial benefit and without Southwest's authorization," the airline said in its complaint.
A Kiwi.com spokesperson on Friday said: "Southwest makes its flight and fare data publicly available to the entire internet, and it cannot legitimately prevent fare competition and price comparisons through enforcement of its browsewrap terms of use, to which Kiwi.com never agreed in any event."
Kiwi.com often handles more than 20 billion price checks per day. Its data comes from hundreds of sources, including airline websites and APIs.
"At a high level, this case is about whether public information is, in fact, public. Southwest Airlines seeks to restrict online competitors' access to public online fare data," the Kiwi.com spokesperson said. "Ultimately, it should be up to consumers, not Southwest Airlines, to decide where to buy their airline tickets."
Seeing the threat posed by the Texas lawsuit, Skiplagged decided to sue Southwest in New York, its home state, in a preemptive legal move. The complaint didn't say where Skiplagged's data came from.
Skiplagged, speaking through its lawyer, Irwin B. Schwartz, of BLA Schwartz PC, declined to comment. A Southwest spokesperson also declined to comment.
The Skiplagged lawsuit followed a volley of private letters between Southwest and Skiplagged this year, according to the complaint. Both companies declined a request to share the letters, but Skiplagged's complaint described a communication from Southwest as "threatening."
In two letters in early June, Southwest accused Skiplagged of "unlawfully 'web scraping' data from Southwest.com," among other complaints, according to a court filing.
A few days later, Skiplagged sent its own letter, telling Southwest it didn't scrape data from the airline's website.
By early July, Southwest had responded with escalating claims, telling Skiplagged that it was "inducing Kiwi.com to breach Southwest's website" by linking to that site, according to the complaint.