Do you know any name of the pilot that provides cargo?
select t2.pilot from operate_company as t1 join flight as t2 on t1.id = t2.company_id where t1.principal_activities = 'Cargo'
Ok.  Do you know any name of the pilot that provides a company "catering services" activities?
select t2.pilot from operate_company as t1 join flight as t2 on t1.id = t2.company_id where t1.principal_activities = 'Catering services'