Domestic air transport, which until recently had been dominated by a select few air carriers, has recently seen a surge in popularity due in large part to the expanding services of low cost carriers. In Bangkok, Pattaya, and other large cities, public motorbike taxis take people door to door. An overwhelming number of taxis can also be found in Bangkok. Since the country's first rapid rail transit line opened in 1999 in Bangkok, daily ridership on Bangkok's various transit lines has risen to over 800,000, with multiple additional lines either under construction or being proposed.