Dublin Airport passengers will be delighted to know that security rules are being relaxed on flights following a huge security machine upgrade. Dublin Airport passengers will be delighted to know that security rules are being relaxed on flights following a huge security machine upgrade. Pic: Dublin AirportPassengers departing Dublin Airport won’t have a 100ml liquid limit anymore, either — with passengers now being able to carry up to two litres in their hand luggage. The 100ml liquid limit will be lifted, with passengers being able to bring up to two litres through Dublin Airport’s security. Pic: Dublin Airport‘This is a very positive and welcome development for passengers and staff,’ Gary McLean, Managing Director at Dublin Airport, said.