An accelerator (112, 200) to provide a combined transport combining Wide-Area Network "WAN" transports (120, 122, 124), the accelerator comprising: a tunnel manager configured to maintain tunnels (170, 172, 174) traversing each of the WAN transports (120, 122, 124); an inspector configured to perform packet and IP flow classification to set a respective classification metric for a downstream packet to be sent over the combined transport; a transport selector configured to select a preferred tunnel from the tunnels (170, 172, 174) based on the respective classification metric of the downstream packet; and a sender configured to send the downstream packet over the preferred tunnel, wherein the WAN transports (120, 122, 124) comprise a high latency satellite transport and a low latency transport (122, 124), and a respective tunnel (170, 172, 174) connects the accelerator to a peer accelerator via one of the WAN transports (120, 122, 124), wherein the average round-trip time of the high latency satellite transport is at least 100 ms greater than the average round-trip time of the low latency transport (122, 124); and wherein the accelerator (112, 200) is configured to select, from the tunnels (170, 172, 174), a tunnel (172, 174) associated with the low latency transport (122, 124) as the preferred tunnel when the respective classification metric indicates a start-up period of bulky traffic, and select, from the tunnels (170, 172, 174), a tunnel associated with the high latency satellite transport as the preferred tunnel when the respective classification metric indicates post the start-up period, wherein the start-up period is set to be less than or equal to a round-trip time over the high latency satellite transport. a tunnel manager configured to maintain tunnels (170, 172, 174) traversing each of the WAN transports (120, 122, 124); an inspector configured to perform packet and IP flow classification to set a respective classification metric for a downstream packet to be sent over the combined transport; a transport selector configured to select a preferred tunnel from the tunnels (170, 172, 174) based on the respective classification metric of the downstream packet; and a sender configured to send the downstream packet over the preferred tunnel, wherein the WAN transports (120, 122, 124) comprise a high latency satellite transport and a low latency transport (122, 124), and a respective tunnel (170, 172, 174) connects the accelerator to a peer accelerator via one of the WAN transports (120, 122, 124), wherein the average round-trip time of the high latency satellite transport is at least 100 ms greater than the average round-trip time of the low latency transport (122, 124); and wherein the accelerator (112, 200) is configured to select, from the tunnels (170, 172, 174), a tunnel (172, 174) associated with the low latency transport (122, 124) as the preferred tunnel when the respective classification metric indicates a start-up period of bulky traffic, and select, from the tunnels (170, 172, 174), a tunnel associated with the high latency satellite transport as the preferred tunnel when the respective classification metric indicates post the start-up period, wherein the start-up period is set to be less than or equal to a round-trip time over the high latency satellite transport.