The Amazing Spider-Man #291 (1987)
Writer: David Michelinie
Artist: John Romita Jr.
Mary Jane says she doesn’t know and flies to Pittsburgh to deal with a family matter. Alistair Smythe sends a Spider Slayer after Spider-Man, but fails to kill him. Peter gets a call from MJ, saying she was wrong and she needs him and she asks him to come to Pittsburgh to help her. Alistair Smythe tracks Peter to the airport via gas from their battle and then buys a ticket for the next flight to Pittsburgh.