The airline division of UK travel operator Thomas Cook Group weathered summer European aviation disruptions to post a 37% profit growth to £129 million ($150 million) for the financial year ended Sept. 30.

“The European aviation market was marked by disruption in summer 2018 caused by delays of the registration of new aircraft, shortage on spare parts, and an air traffic control system that was not fully prepared for the strong growth,” the group said.

These events resulted in irregularity costs more than doubling to £101 million compared with 2017, the group said. Irregularity costs include European Union-mandated passenger-compensation, welfare, sub-charter and denied-boarding costs.

The group operates two airline brands: Thomas Cook Airlines (UK, Scandinavia and Balearics) and Condor (Germany).

The leisure operator has been expanding in the European market. Thomas Cook Airlines Balearics, based in Mallorca, Spain, began operations earlier this year. Also in 2018, the group acquired Airberlin Aviation, an affiliate of bankrupt airberlin, to speed up its growth in the German market. Thomas Cook will use Airberlin Aviation in the German market separately from its Condor subsidiary.

The airlines’ fleet comprises 100 aircraft, with a mix of Airbus A320s, A321s and A330-200s, as well as Boeing 757-300s and 767-300ERs.

Kurt Hofmann,