Conversation so far:
what was operation Bojinka ?
When was Operation Bojinka started ?
Who was the instigator of Operation Bojinka ?
Besides Khalid Sheik Mohammed and Ramzi Yousef, were there any other people involved in Operation Bojinka ?
Where operation Bojinka was planned ?
Did operation Bojinka happened ?

Question: Did Yousef bomb other planes other than flight 434 ?
Self-contained rewrite: Did Yousef bomb other planes other than flight 434 ?