William,
I've voiced my protest by emailing the Spanish Tourist Office in London - the press section at
press.london@tourspain.esThe charge is way in excess of the low cost airlines (question whether they will follow suit); it's way more than what Iberia charges for excess baggage and I reckon the charge bears no relation to the cost the airline incurs in transporting bikes which do after all go in the hold along with other baggage.
Next they'll classify backpacks as sporting equipement and whack an extra charge for carrying these!
Seriously though for the next part of my Via de La Plata I will not be flying Iberia into Salamanca and will take either Ryan Air or Easy Jet to Vallodolid or Oviedo/Asturias instead and then bus to Salamanca to take up the Plata again.