Bydd cytundeb hanesyddol yn cael ei lofnodi gan Lywodraeth Cymru a chwmni Heathrow Airport Ltd er mwyn cefnogi twf economaidd a chwblhau'r drydedd redfa ym maes awyr Heathrow.
An historic agreement between the Welsh Government and Heathrow Airport Ltd to support economic growth and the delivery of the 3rd runway.