Aer Lingus is Ireland's national flag carrier airline and its second biggest airline after Ryanair. It operates mainly Airbus aircraft serving Europe, North Africa, Turkey, and North America. While no longer a member of an airline alliance, it has codeshare agreements with major alliance members. Aer Lingus has adopted a hybrid business model operating both low-cost and full-service flights. It is headquartered at Dublin Airport and has operating bases in Belfast, Cork, London Gatwick, London Heathrow, and Shannon, with its main hub in Dublin.