well the list below is Europe's Premier League as measured by 20 million passengers in 2014 (taken from Wikipedia). Of these, which meet the criteria stated and which don't then? Does MAN stand out as being 'special'?
For me, Palma and Antalya stand out as having a lack of flag carrier base. Both are resort destinations of course.
Being Spanish, I suspect Palma it might have had regional money pumped into it to expand mind.
1
United KingdomLondon-Heathrow Airport 73,405,330
2
FranceParis-Charles de Gaulle AirportParis63,813,756
3
GermanyFrankfurt AirportFrankfurt59,566,132
[
4
TurkeyIstanbul Atatürk AirportIstanbul56,954,790
5
NetherlandsAmsterdam Airport SchipholAmsterdam54,978,023
6
SpainAdolfo Suárez Madrid–Barajas AirportMadrid41,833,374
7
GermanyMunich AirportMunich39,700,515
8
ItalyLeonardo da Vinci–Fiumicino AirportRome38,506,908
9
United KingdomLondon-Gatwick AirportLondon38,103,667
[
10
SpainBarcelona El Prat AirportBarcelona37,559,044
11
RussiaDomodedovo International AirportMoscow33,040,000
12
RussiaSheremetyevo International AirportMoscow31,568,000
13
FranceParis-Orly AirportParis28,862,586
14
TurkeyAntalya AirportAntalya28,341,063
15
DenmarkCopenhagen AirportCopenhagen25,627,093
[
16
SwitzerlandZürich AirportZürich25,477,622
17
NorwayOslo Airport, GardermoenOslo24,269,235
18
TurkeySabiha Gökçen AirportIstanbul23,631,883
19
SpainPalma de Mallorca AirportPalma de Mallorca23,115,499
20
AustriaVienna International AirportVienna22,483,158
21
SwedenStockholm-Arlanda AirportStockholm22,443,272
22
United KingdomManchester AirportManchester21,989,682
23
BelgiumBrussels AirportBrussels21,933,190
24
GermanyDüsseldorf AirportDüsseldorf21,850,489
25
IrelandDublin AirportDublin21,712,173
26
GermanyBerlin Tegel AirportBerlin20,688,016