In addition to Airplane
and (the original) Mission Impossible
; Peter Graves also did several television commercial advertisements... the most recent being for AirTran Airways, promoting its WiFi.
Other commercials spots include:
TRW (credit report company) circa either 80s or 90s.
Ford Motor Company at least twice: once for the 1975 LTD and again for the 1980 LTD & Crown Victoria.
There are probably a few others if one does some digging; I'm going straight by memory.
IIRC, Graves even made a cameo appearance in the first Mission Impossible
"TransEastern! You'll feel like you've never left the ground because we treat you like dirt!" SNL Parady ad circa 1981