Mark replied with the all-time classic - “BECAUSE IT'S THERE!"
Purchase Mark's book "Because It's There" via Abela Publishing: http://abelapublishing.com/because-its-there_p27702905.htm
Mark is a fulltime pilot with Missionary Aviation Fellowship (MAF). He is based at Lanseria Airport, just north of Johannesburg, and can be found flying missionaries, medical supplies and cargo into most Southern African countries with the odd foray into more Northern African countries like the Sudan, Kenya, Chad or Tanzania.
When Mark was asked Why undertake such an epic journey? He replied with the all-time classic
BECAUSE IT'S THERE!"
10% of the net profits from the sale of this book will be donated to charities in South Africa.