The Star League Sourcebook's version (squadrons of white aerospace fighters escorting 20 Star League transports near the Capellan Periphery) is listed between the appearance of Wolf's Dragoons and the Disappearing Battleship of Merope. This might suggest it occurred before 3005 but after the Merope incident, but none of the three events are dated there.
The ComStar Sourcebook combines the White Wings and the Disappearing Battleship into a single incident in 2979 (maybe 2980, depending on which month Primus Sims died in, how fast the next Primus was selected, and how fast the ComGuard deployed).
I don't know if the Jihad sourcebooks mention the incident at all.