First Officer Simon Wood allegedly sexually assaulted at least 50 children in Kenya and Uganda between 2001 and 2013.
It is believed that BA staff were told of concerns about Wood’s behaviour twice in that time.
A number of those victims are now suing the airline for compensation.
BA says it will “robustly” defend itself against the action.
Wood, 54, from Potters Bar, Hertfordshire, flew BA routes to Kenya and Uganda for more than a decade.
There he volunteered at several charities including an AIDS orphanage.
In July 2013, Wood was arrested by police after an anonymous tip-off. He was charged with indecent assault and possessing indecent images.
In August that same year, shortly before he was due to appear in court, Wood killed himself.
It later emerged that he was first arrested over an indecent assault allegation in the UK in 2001.
Prosecutors ruled there was insufficient evidence to charge him.