London Luton Airport (LTN) is often perceived as "small" when compared to the gargantuan size of Heathrow or Gatwick, but it is actually a major international hub and the fifth busiest airport in the UK. In 2025, it handled over 16 million passengers, which is more than many "main" national airports in other European countries. It features a single, relatively compact terminal building, which makes it easier to navigate on foot than larger airports, but this can also lead to significant congestion during peak travel hours. Luton is the primary base for low-cost carrier easyJet and a major hub for Wizz Air, serving over 150 destinations across Europe, the Middle East, and North Africa. While it lacks the multiple terminals and vast transit systems of Heathrow, the 2023 opening of the Luton DART (Direct Air-Rail Transit) has significantly modernized its connection to the railway station, making it feel like a more integrated part of the London airport network. So, while it is physically smaller in footprint, its "weight" in terms of flight volume and passenger traffic is quite substantial.