Ibrahim Savant, Arafat Waheed Khan and Waheed Zaman, all from London, were found guilty by a jury at Woolwich Crown Court in London and could face life imprisonment when they are sentenced.
The trio were tried last year in connection with a 2006 plot to blow up seven transatlantic flights from Britain to North America using liquid explosives, but cleared of specifically targeting airlines.
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A total of 12 people have now been convicted in relation to the liquid bomb plot, including ringleader Abdulla Ahmed Ali, who was sentenced last September to a minimum of 40 years in jail.

