Kiwi Aviation 
4K
Visible but unclear in low resolution (example: ZK-...)
Not an airline; likely a flight school (registration starts with ZK-, indicating New Zealand)
PA28
CHC/NZCH
Piper Aircraft Piper PA-28 Cherokee/Warrior/Archer series
A pair of classic Piper PA-28 Cherokees parked on the flight line, standard for flight training at many GA airports.