I'd choose BCN
. As Aussie747
said, there's a lot of flights only
in the air shuttle operated by IBERIA
daily. But the roughly 45 is actually 52 return flights. And this is just Air Shuttle: you buy a ticket with no hour, you reach the airport and fly the first available seat.
Then, there are some regular flights, also by Iberia, not able to say the number now, but just a bunch, a few ones.
Plus many flights that serve MAD
-another city and come back frm another city-BCN
, (for example 3966 MAD
and 3967 ATH
, or 6940 MAD
and 6941 TLV
) that have people flying just the BCN
leg. These are a good dozen more.
Finally, there are also Air Europa and Spanair, with roughly 20 return flights each.
Actually, for about a couple of years, ATCs have been training new altitudes and new vertical separations that came into service more or less one year ago, improving dramatically the service between the pair. Now there are duplicated cruise altitudes and routings because the movement was at the limits.
We could be easily counting slightly above 100
round frequencies a day. I could look for the exact figures if you are very interested, now I do not have them with me.