The Dublin Airport Authority (DAA) has said it expects flights to continue to operate as normal at Dublin and Cork airports in the event of a no-deal Brexit.
It comes as the DAA is planning to roll out a communications campaign to inform the public what will happen if the UK leaves without a deal.
Niall MacCarthy, the DAA's executive Brexit lead, told a Seanad special select committee yesterday that: "If the UK leaves the EU without a deal, emergency regulation will come into force at EU level to protect air connectivity for passengers and freight between the EU and the UK."
Mr MacCarthy also addressed the issue of how passenger journeys will be affected in the event of a no-deal Brexit for people departing at their airports.
"In terms of security processes, there will be no changes or additional requirements for UK-bound passengers departing from Irish airports, as a result of a no-deal Brexit," he said.
"UK-bound passengers will simply continue to comply with all current security processes and requirements, with no change anticipated from existing processes.
"Furthermore, the Irish Government has now confirmed that duty-free shopping will return on alcohol and tobacco products if the UK leaves the EU without a deal.
"Passengers departing from Irish airports to UK airports will be able to purchase these products at duty-free prices, but only in the event of no deal.
"Other than this, we do not anticipate any other significant implications for passengers departing through Irish airports."
In the event of a no-deal Brexit for passengers arriving at their airports from the UK, he said that at airport immigration, UK passport holders arriving at Irish airports are currently processed through the 'EU/EEA/CH' channel, but this would not change.
"If the UK leaves the EU without a deal, the Irish Naturalisation and Immigration Service has confirmed that UK passport holders will continue to be processed through the 'EU/EEA/CH' channel - however, this 'EU/EEA/CH' channel will be redesignated as an 'EU/EEA/CH and UK' channel," he told the committee on Brexit.
"There will be no additional or onerous immigration checks applied to UK passport-holders at Irish airports.
"It is important we all get this message out, as there is likely to be confusion."