A few examples of what you can ask Wolfram|Alpha about:
get information about an automobile model
get data on road lengths for a given country
get data on vehicles in use
get traffic data for a specified country
get data on road accidents
get gasoline price data
locate an airport and get information about it
do computations on airline data
compare several aircraft
get data for a specified flight
get data on rail transport by country
get information about a railroad station
get information about a cruise ship
get information about a property of an aircraft carrier
compare shipwrecks
get information about a manned space mission
get information about a space shuttle
compare space probes
find rockets with specified properties
compute the orbital period of a massive body orbiting another
compare warp factors to the speed of light
get current tide information
get a tide forecast