Delta
Yes Frontier airlines operates mainly out of Denver airport.
The Skyscanner website shows information about cheap airlines in Belgium. One cheap airline in Belgium is Ryanair which operates from Charleroi airport.
The MAS airline is based in Malaysia. It operates its flights from its home base which is Kuala Lumpur International Airport with a secondary hub at Kota Kinabalu and Kuching.
The only airline that operates the Cardiff - Amsterdam route is KLM: Royal Dutch Airlines
To obtain a gate pass at Atlanta Airport, you will need to contact the airline you are flying with and inquire about their specific procedures for obtaining a gate pass. Typically, gate passes are issued for reasons such as accompanying a minor or a person with special needs, but each airline may have their own policies in place. It is important to check with the airline directly for the most accurate and up-to-date information.
The airport is not operated by an airline. The airlines are tenants, including Delta, the largest airline. They pay the airport for the right to operate there.
From airport ATL to Airport KIN. A round trip ticket cost anywhere from $350 to $500 depending on what airline you choose to give you business to.
Air Berlin operates out of Terminal 8 at John F. Kennedy International Airport (IATA: JFK, ICAO: KJFK)
The flight time from Johannesburg, South Africa to Hartsfield-Jackson Atlanta International Airport is about 16 hours, 52 minutes.
Atlanta Hartsfield Jackson International Airport
It is approximately 1,100 miles from the Atlanta airport to the Boston airport.