Galaxy 17 began its move to 91° West longitude when Horizons-2 was launched and placed in the 74° West longitude slot. Horizons-2 was originally slated to replace SBS-6 but the launch was delayed, possibly due to the delayed repairs of the Sea Launch vessel.
Galaxy 17 began its relocation to a new orbital position when Horizons-2 was launched and took over the 74° West longitude slot. Initially, Horizons-2 was meant to replace SBS-6 but the launch was rescheduled, possibly because of the delayed maintenance of the Sea Launch spacecraft.