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The increasing number of interfaces using different access technologies in modern devices gives opportunities for enhancing the quality of service (QoS) delivered to multimedia and interactive data transfers involved in mobile and distributed applications. In the modern Internet though, the presence of "middleboxes" (such as NATs, firewalls or proxies) hardly lets applications use any transport protocol but the well-known Transmission Control Protocol (TCP). Currently under standardization at the IETF, the new Multipath-TCP (MPTCP) protocol uses several TCP flows to make use of the multiple interfaces available on the end terminals, thus improving both network availability and QoS, still being capable to cross over middleboxes. Although originally being fully reliable and fully ordered, its two sub-layers architecture gives opportunity to use QoS techniques over fully reliable paths. This paper studies the QoS …