UptoathirdofallEuropeanflightsareatriskofbeingdelayedorcancelledthissummerafterairtrafficcontrollerssaidtheywouldstrike.ControllersatEurocontrol,theEuropeanairtrafficmanagementbody,revealedthattheywouldwalkoutoverthepeaksummerperiodaftertalksoverstaffing,rostersandpaybrokedown.BritishholidaymakersnowfaceanagonisingwaittofindoutiftheirflightstoandfromtheUKareaffected,withdatesforthewalkoutsexpectedtobeannouncedwithindays.Anindustrysourcesaiditcouldleadtodelaysorcancellationsofupto12,600flightsacrossEuropeeveryday.“Inafull-blownstrike,20to30percentofflightswouldbeatleastdelayed,”thesourcesaid.“Theyarebignumbers.”Thebodyisexpectingtohandleabout33,000flig...