Explanation

 The world's first public airline was DELAG (Deutsche Luftschiffahrts-Aktiengesellschaft),

It was founded on November 16, 1909, with government support

Its headquarters is in Frankfurt

DELAG, meaning "German Airship Navigation Company,"

Explanation

Airblue is a private Pakistani airline.

It is Pakistan's second-largest airline with a growing share of the domestic market.

Explanation

Qantas Airways Limited is the airline of Australia

it is the country's largest airline by fleet size, international flights

it is the second oldest airline having been founded in November 1920

they began international passenger flights in May 1935. 

its Headquarters in Mascot, New South Wales, Australia

Explanation

Cathay Pacific Airlines Ltd. (CPA), extra widely called Cathay Pacific

It is the flag carrier of Hong Kong,

Founded: 24 September 1946

Headquarters: Hong Kong, China

Founders: Sydney de Kantzow,Roy Farrell

Explanation

Ariana Afghan Airlines, also known as Ariana.

It is the flag carrier and largest airline of Afghanistan.

It is founded in 1955.

It is the oldest airline of Afghanistan.