— Raleigh-Durham International Airport officials have issued permits to 10 drivers who work for the Uber ride-sharing service.

RDU had called Uber and fellow ride-sharing service Lyft illegal taxis, handing out more than 100 trespassing citations to drivers in recent months.

In order to standardize the service and fares charged by taxis that serve the airport, RDU requires all cabs to obtain a permit, carry proof of $1.5 million in liability insurance and have drivers who have undergone background checks and physicals.

Airport spokeswoman Mindy Hamlin said Monday that the 10 drivers met the permit requirements on their own, including applying for and receiving "for hire" tags from state of North Carolina and installing transponders that allow RDU to track trips to and from the airport – and therefore charge fees on them.

Uber and Lyft have called RDU's permitting process outdated and say ride-sharing gives travelers another option to get to and from the airport. Yet, both companies have been working with RDU on solutions around the impasse.

Uber, for example, has set up a "geofence" around the airport that prevents people who are booking a ride through Uber's app from seeing drivers on RDU property.