Some flights were diverted to Porto as Lisbon was full. Almost all airlines diverted to Porto, which meant that there is a lack of slots in the summer of 2018 [March to October], he said.
He added that these limitations at Porto should end next year after the airport manager improves the runway enabling capacity to increase once again.
José Lopes also said that decisions had to be taken to increase capacity at Lisbon airport before the secondary airport at Montijo comes on line in 2022.
Easyjet has nine aircraft based in Lisbon and flies 61 routes to nine European countries.