There have been 82 NFL Conference Championship games played since the 1980-81 season. Let's take a look at the data, from a "Vegas" perspective.
Home Teams: 46-36 ATS, including 39-29 ATS as Favorites, 7-6 ATS as Underdogs, 0-1 ATS as PK
Road Teams: 36-46 ATS, including 6-7 ATS as Favorites, 29-39 ATS as Underdogs, 1-0 ATS as PK
Underdogs: 36-45 ATS
Favorites: 45-36 ATS
Double Digit Favorites: 3-8 ATS
Double Digit Underdogs: 8-3 ATS
Revengers: 30-40 ATS, including 5-8 ATS in Division games. Favored Revengers 12-10 ATS; Underdog Revengers 17-30 ATS; PK'em Revengers 1-0 ATS
Off ATS Loss (vs. Foe Not Off ATS Loss): 16-12 ATS, including 9-7 ATS as Favorite; 7-5 ATS as Underdog; 9-9 ATS at Home; 7-3 ATS on Road
Off Double Digit Win (vs. Foe Not Off Double-Digit Win): 20-20 ATS, including 15-15 ATS Home; 5-5 ATS Away; 16-15 ATS as Favorite; 3-5 ATS as Underdog; 1-0 ATS as PK
Off Upset Win (vs. Foe Not Off Upset Win): 17-20 ATS, including 1-0 ATS at Home; 16-20 ATS Away; 3-1 ATS as Favorite; 14-19 ATS as Underdog
Overs: 44-35-3
Unders: 35-44-3
Good luck, as always...Al McMordie