Fraport Kos International airport is the 7th biggest in Greece.

Arrivals:

• 2.32 million
• Of which 2.1 million are international
• 200,000 are domestic

More details here:

https://www.fraport.com/content/fraport/en/our-company/fraport/fraport-group/our-airports/kos-airport.html

Kos Airport upgrades:

http://www.fraport-greece.com/eng/airport-profiles/kos