Aer Lingus has reported an operating profit of €104 million for the first six months of the financial year.
That was almost double the figure of €53 million reported for the same period last year.
It came on the back of passenger revenue of €867 million, up from €803 million reported in the first six months of 2017.
Aer Lingus's parent group, IAG, reported an operating profit of €1.735 billion for the first six months.
The group's brands include British Airways, Aer Lingus, Iberia and Vueling.
IAG CEO Willie Walsh described the results as positive, but he pointed to challenges on the industrial relation front.
"Unfortunately, French Air Traffic Control strikes continued to challenge our airlines’ operations causing disruption to our customers. Vueling was particularly affected and incurred an additional €20 million of disruption costs in the [second] quarter.
"These strikes are also having a significant negative impact on the Spanish economy and tourism."
Commenting on Aer Lingus's performance, CEO Stephen Kavanagh said the airline aimed to be the leading value carrier across the North Atlantic.
"This year Aer Lingus is flying 17 times daily to 13 North American gateways, providing a record 2.75 million seats between Ireland and North America: we have almost doubled our North American transatlantic capacity from Dublin over the past five years.
"This growth has a very positive impact on the wider economy in this country with tourism receipts from North American visitors up 27% since 2015 to over €1.5 billion," he added.
