I still don't know why people think Joe Public would know anything about "Las Palmas" when they have booked a flight to "Gran Canaria" especially if they have not been there before.
No different to booking a flight to Majorca and flying to Palma, or to Menorca and flying to Mahon, or Lanzarote and flying to Arrecife or the Algarve and flying to Faro, or to Crete and flying to Heraklion or Chania, and so on.