Cessna Citation Sovereign (C680)
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Inflight Event / Encounter Other / Unknown
General None Reported / Taken
Environment - Non Weather Related; Procedure
We were on a flight to BOS; obtained the ATIS; and briefed the advertised arrival and approach ILS to 4R. During the arrival [we] were assigned the usual revised clearance for a visual to 4L. The surface winds were out of the southeast so departures were using runway 9. On short final; the Tower cleared an Airbus to depart runway 9. At approximately 75 ft.; over the runway we encountered the jet blast of the departing Airbus which generated a left roll that was countered by the flying pilot and continued the landing on 4L.Suggestions: This potential landing threat was not anticipated and can catch crews very unexpectedly. I have since the event; questioned [other air carrier] crews while on layovers in the area; and learned this was a known safety threat for them when operating into BOS; to the point they ask the Tower not to clear an aircraft for takeoff on runway 9 until they are past runway 9.
CE-680 First Officer on short final to BOS Runway 04L reported encountering jet blast from an Airbus departing Runway 09.