What distance can you see aircraft lights from? My parents bought a house and it's approximately 50-60 km from the nearest airport and one day when it was dark I've noticed lights on the sky and because I live in a big city close to the airport I came to the conclusion that this have to be airplane lights. Is it possible to see them from that far?
Aircraft lights can be easily spotted 50-60 km away during clear nights. 

I used to live in Rotterdam and could spot aircraft at night when they turned exactly towards me at ARTIP which is an initial approach fix of Amsterdam airport Schiphol. ARTIP was exactly 100 km from my house.