Most of the cabs are medium size cars that can squeeze 4 passengers (3 in the back and 1 in the front). If you have a lot of luggage it can be difficult to take 4 with luggage since the trunks are not large. There are some van/taxis that would be able to carry 5, and if you are lucky there might be one in the taxi queue at the airport. If not, you other option would be to take two taxis. When you get outside the luggage area at the airport there will be an employee directing the taxi operations. Ask him for a van and hopt you get lucky.