Pilots on a Southwest Airlines flight attempting to land at Chicago's Midway Airport were forced to make the plane climb suddenly to avoid another aircraft crossing the runway. Airport webcam video posted to X shows the Southwest plane appear to briefly touch down about 8:50 a.m. CST Tuesday before its nose was abruptly pulled up as the second plane is seen on the runway. Southwest Flight 2504 safely landed “after the crew performed a precautionary go-around to avoid a possible conflict with another aircraft that entered the runway,” an airline spokesperson said in an email. “The crew followed safety procedures and the flight landed without incident." Audio recording of communication between the crew and the tower includes the ground tower employee breaking off mid-message to the plane. The pilot then said “Southwest 2504 going around” and followed directions to climb back to 3,000 feet. Seconds later, the audio captures the pilot asking the tower: “Southwest 2504, how’d that happen?” The second plane, described as a business jet, entered the runway without authorization, according to the Federal Aviation Administration. Flexjet, the plane's owner, said the company is aware “of the occurrence in Chicago." “Flexjet adheres to the highest safety standards and we are conducting a thorough investigation,” a spokesperson said in a statement. "Any action to rectify and ensure the highest safety standards will be taken.” Both the FAA and the National Transportation Safety Board say they are investigating the incident. The Southwest Flight was enroute to Midway Airport from Omaha, Nebraska, according to FlightAware. Video source: STREAMTIME LIVE via CNN More local videos here: https://bit.ly/2Pa0d1l Subscribe to NEXT: http://bit.ly/2eP1GwI Stay connected: 9NEWS Website: http://www.9news.com/ Facebook: https://www.facebook.com/ilike9news X: https://x.com/9NEWS Instagram: https://www.instagram.com/9newsdenver/ Download the 9NEWS App: https://www.9news.com/appredirect/ Sign up for the 9NEWSLETTER: https://www.9news.com/email 9NEWS (KUSA) is located in Denver, Colorado.