When have the bills been in the super bowl?
No context provided
What years have the bills been in the super bowl?
1991, 1992, 1993, and 1994,
No context provided
Which super bowls have the Bills been in?
XXV, XXVI, XXVII, and XXVIII
Buffalo Bills
https://en.wikipedia.org/wiki/Buffalo%20Bills
The Bills were in Super Bowls XXV, XXVI, XXVII, and XXVIII, in years 1991, 1992, 1993, and 1994, respectively.