Question: Who built the type of jet that made an emergency landing in Detroit on April 4, 1979?
Sentence (from "TWA Flight 841 (1979)"): On April 4, 1979, at or around 9:48 p.m. Eastern Standard Time (01:48 UTC), while flying over Saginaw, Michigan, the Boeing 727-31 airliner began a sharp, uncommanded roll to the right, and subsequently went into a spiral dive.
Relevant evidence: Yes