Drawn without reference material ... apparently.
ANY airport, especially an international airport(!), would need to occupy a land area larger than Independence Port.
To be honest, you'd want to have a zone the size of some of the Shadow Shard zones(!) in order to fit an international airport with runways 10,000 ft long for heavily loaded 747 flights, and possibly even C5 Galaxy landings (if needed).
Oh and you'd need to "point" those runways in directions that don't aim directly into tall buildings. Are there any tall buildings in Steel Canyon, Perez Park, King's Row, Brickstown, etc. ...?
Trust me, you'd have to go someplace either south or east of the entire map to find enough open space that doesn't send flight lines into buildings to have an international airport near Paragon City.