I will be visiting Portugal in May, flying into Porto and out of Lisbon. Was reading RS Portugal about the aerobus from the airport. I assume one can get the aerobus to the airport as well. Since I won't arrive from the airport, was wondering if I can purchase tickets for aerobus on the bus. Has anyone used the aerobus from lisbon city center to airport? Thanks.
Yes, you could take the reverse route from any of the Aerobus stops and buy tickets onboard. Some of Rick's maps in the book also mark the bus stops; on the bottom of p. 104, I see one marked next to the Tourist Info point.