UK flyers helping to fuel growth
Airlines don't launch new routes on a whim. Costs, revenue projections and demand are carefully analysed before any new service comes on stream.
Passenger numbers are closely tied to economic growth. The new San Francisco route speaks strongly about the demand that exists in the business community for such a service.
Tech giants from Apple to Google – all with HQs in Silicon Valley – have been pushing for a direct link with their home turf.
The growth in Aer Lingus long-haul traffic is also being propelled by a growing number of UK passengers who use the Aer Lingus Regional service to connect to Dublin and on to the US.
Aer Lingus chief executive Christoph Mueller, said this week that the carrier saw a 36pc rise in the number of UK passengers flying to the US via Dublin in June compared to June 2012.
He said Aer Lingus was carrying about 100,000 UK passengers a year to the United States from Dublin.
And he says Dublin has recently eclipsed Amsterdam's Schiphol airport as the preferred hub for UK travellers who want to fly to the US but avoid Heathrow.
Over the past few years, aviation experts have cited Dublin's potential to become an alternative hub to Heathrow for transatlantic passengers.
Now it appears that, at least on a small scale, that's beginning to happen.