At the beginning of the episode there are reports of a UFO. An AirForce officer shows up and says they have 2 F-16s flying in to intercept.

The fighter planes that really fly in are 2 F-18s

I verified this as I had recorded this using my DVR. I played back the scene with the CloseCaption turned on and listened yet again. Plus slowed the video down and you can easily make out the difference between the F-18 and F-16