Martinez, who uploaded his videos after the plane landed, told CBS that he saw "blood everywhere" inside the plane.
“She wasn’t like sucked out of the window or pulled out. But her like arms and her body were sucked, like sucked in that direction, from my vantage point. So you see people, from the back of the seat, holding onto her, you know, trying to keep her contained,” Martinez told CNN.
Southwest issued a brief statement in the immediate aftermath of the incident, writing:
"We are aware that Southwest flight #1380 from New York La Guardia (LGA) to Dallas Love Field (DAL) has diverted to Philadelphia International Airport (PHL). We are in the process of transporting Customers and Crew into the terminal. The aircraft, a Boeing 737-700, has 143 Customers and five Crewmembers onboard. We are in the process of gathering more information. Safety is always our top priority at Southwest Airlines, and we are working diligently to support our Customers and Crews at this time."
UPDATE: Southwest issued another statement later on Tuesday afternoon, confirming one fatality on Flight 1380. It also issued a video apology (shown below) featuring Southwest CEO Gary Kelly, who called the incident "a sad day."
"Southwest Airlines Co. (NYSE: LUV) confirms an accident involving Southwest Airlines Flight 1380. The flight made an emergency diversion to Philadelphia International Airport (PHL) earlier today after the Crew reported issues with the number one engine which resulted in damage to the fuselage.
We are deeply saddened to confirm that there is one fatality resulting from this accident. The entire Southwest Airlines Family is devastated and extends its deepest, heartfelt sympathy to the Customers, employees, family members and loved ones affected by this tragic event. We have activated our emergency response team and are deploying every resource to support those affected by this tragedy. For a message from Gary Kelly, Southwest Chairman and Chief Executive Officer, please click here.
The aircraft involved today was a Boeing 737-700 (N772SW) and was enroute from New York LaGuardia (LGA) to Dallas Love Field (DAL). In total, the flight had 144 Customers and five Southwest Crewmembers onboard. We extend our heartfelt appreciation to the Southwest Pilots and Flight Attendants who acted professionally and swiftly to take care of our Customers during the emergency diversion and landing.
Finally, Southwest Airlines officials are in direct contact with the National Transportation Safety Board (NTSB) and the Federal Aviation Administration (FAA) to support an immediate, coordinated response to this accident. Southwest is in the process of gathering additional information regarding flight 1380 and will fully cooperate in an investigative process.
Please join the Southwest Family in keeping all of those affected by today's tragedy in your thoughts."