Question: Information: - Air Sinai ( Arabic : Sna ' lil - ayyarn ) is an airline based in Cairo , Egypt . It operates as a ' paper - airline ' for parent company EgyptAir under a '' wet lease '' - like agreement . - EgyptAir (Arabic: , "") is the flag carrier airline of Egypt. The airline is based at Cairo International Airport, its main hub, operating scheduled passenger and freight services to more than 75 destinations in the Middle East, Europe, Africa, Asia, and the Americas. With an extensive network of domestic services focused on Cairo, Egypt's capital, the airline is working to regain profitable operations following the revolution of 2011. Egyptair is a member of Star Alliance, having joined on 11 July 2008 and also of Arabesk Airline Alliance and the Arab Air Carriers Organization. - Cairo International Airport (Arabic: ; "Mar al-Qhirah al-Dawlyy") is the international airport of Cairo and the busiest in Egypt and serves as the primary hub for EgyptAir, EgyptAir Express and Nile Air as well as several other airlines. The airport is located in Heliopolis, to the northeast of the Cairo around from the business area of the city and has an area of approximately . It is the second busiest airport in Africa after OR Tambo International Airport in Johannesburg. What is the relationship between 'air sinai' and 'cairo international airport'?
Answer:
airline hub