Originally Posted by
irishguy28
Because airlines don't go to the bother of filing fares for every potential routing - only the ones that make sense. Their website can only sell tickets for routes for which a fare has been filed. Basic geography, economics, and common-sense dictate that an airline cannot compete viably on every potential route. Airlines are in the business of transporting people - not facilitating every potential booking desired by a mileage/status hunter!
Not sure, they file fares that cannot be booked on their website, and there are A3 through fares DUB BCN routed via ATH although this city pair cannot be selected on their website.
And in the past, I could even get an A3 through fare MAD BCN via ATH: cheaper than the high speed train, 20 hours in ATH included, upgradable to C with vouchers. Ah those good old days...