Heathrow Airport LHR guide: Heathrow Express €37, Elizabeth Line €16, Tube €7.50. 4 operational terminals (T2, T3, T4, T5), Priority Pass lounges. March 20

Istanbul Airport IST guide: Havaist bus €6.00, taxi €45-60, Turkish Airlines Lounge access, single terminal layout. March 2026.

Frankfurt Airport FRA guide: S-Bahn €5.35, ICE train 10 mins, Lufthansa Senator Lounge, Terminal 1 & 2 layout. March 2026.

Dublin Airport DUB guide: Dublin Express bus €20 return, 51st & Green Lounge T2, Terminal 1 vs 2 layout, US Preclearance tips. March 2026.

Barcelona BCN guide: Aerobus €11.80 return, Metro L9 €5.15, T1 vs T2 shuttle, Sala Pau Casals lounge access. March 2026.

Amsterdam Schiphol AMS guide: Train to Central €6.50, KLM Crown Lounges, Aspire Lounge access, single terminal complex. March 2026.