THE National Consumer Agency (NCA) forced Ryanair and Aer Lingus to provide email addresses to customers.
The NCA issued compliance notices to the two airlines during 2013 over their breach of EU regulations by failing to provide contact email addresses on their websites - and both have now rectified the matter.
The NCA said email addresses were needed to allow consumers contact the airlines "rapidly and in a direct and effective manner".
Both airlines now have email addresses on their websites, whereas before, customers could only contact them by post or by phone.
The NCA has now published a list of all the enforcement actions it took between July and December 2013.
Meanwhile, some 14 supermarkets and other retailers were also issued with compliance notices for charging more for items than the price displayed.
These included Tesco branches in Galway Shopping Centre, Killarney Park and Tullamore Retail Park and Ashe Road Mullingar as well as Iceland in Greencastle Parade, Coolock, and Mothercare in Carrickmines.
Spar outlets on Upper Leeson Street, Dublin 4, and at Greenpark Shopping Centre in Limerick also received compliance notices, as did Eurospar in Northern Cross Shopping Centre, Costcutter in Balrothery, Co Dublin, Joyce's Supermarket in Tuam Shopping Centre, Superdrug, The Square, Dublin 24, and Centra at Killinarden Shopping Centre.
Two pubs were also fined for failing to display drink prices - Phil Hegarty's on Main Street, Buncrana, Co Donegal and Quinns Bar, Lower Drumcondra Road, Dublin 9.