Upvote:2
In many cities in Spain the 'suplementos' fee is what a taxi charges for driving you from the airport or to the airport (and some other places where there's organized parking for taxis, such as some train stations). The amount should be written somewhere on one of those stickers in taxi, but you can just ask the driver about it. This is typically a fixed fee, but it might vary between taxi companies (it is rare though).
Thus you cannot avoid it if you take taxi from or to the airport. However you can walk outside the airport property (typically behind the parking toll gate), and catch a taxi there, if it is possible.
Upvote:4
I can't make out the small print on the image you posted, but the suplementos appear to be listed on this page. They include:
€0.65/suitcase
€1.05/radio call
€2.90 for trips to/from the airport or Na Burgesa and from Pier Pelaires or Dec Oest
€4 for trips to/from Banyalbufar, Estellens, Deia (by Soller), Cala Deia, Sa Marina de Valldemossa, or Escorca.
€8 for trips to/from Cala Tuent or Sa calobra
And a €13 minimum charge for all airport trips
Different fares are also used for at night and on weekends, and for trips outside of the Palma municipal area.
The airport website shows almost the same supplements, with a slight discrepancy on the baggage charge: €2.90 for trips to/from the airport and €0.60 per suitcase.