I had been called once in Nairobi to be told that there was a change of aircraft and no F on the flight I had originally booked. They had re-booked me in J on the new aircraft (no choice). When I asked for compensation, I was told they would offer it at the airport. They offered US$50, which I refused to accept. I was encouraged to write to EK, which I did, and they offered a free return F ticket NBO-DXB-NBO.^^^