`Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) says that I have accompanied the Prophet Muhammad (peace be upon him) (on many journeys), but I have never seen him offering Sunnah prayers during travel, and Allah Almighty (in Surah Al-Mumtahina) says that "Indeed, in the actions of the Messenger of Allah (peace be upon him) there is a best example for you."