Are taxi drivers in Newcastle Airport licensed?
  Yes, taxi drivers in Newcastle Airport are required to have a license issued by local authorities or Transport for London. 
   Can Newcastle Airport taxi drivers provide tour guide services?
  Yes, Newcastle Airport taxi drivers can provide tour guide services if they have adequate knowledge and comply with local regulations. 
   Is tipping customary for taxi drivers in Newcastle Airport?
  Yes, tipping is customary for taxi drivers in Newcastle Airport, typically around 10-15% of the fare.