Startup Idea : Airport transport compare

Unlike normal taxi companies an Airport Service taxi is usually booked in advance. Whenever I have to book an airport taxi I have to calculate the distance of the route the cab will have to take (company location > customer home > extra pickups along the way > airport > company location) and compare the prices on all these taxi company's their websites. Sometimes you even have to request an price offer before you can even get a prices.I would suggest creating an App where you enter your home location and the airport location (and additional pickups). The app will calculate the route/distance and price and display a list of the cheapest cabs (which will have to register and enter their prices) in your neighborhood. Additional features could be: rate cab, add comments, share a cab, compare with public transport, ...