Running an airport is big business. Millions of travelers pass through London every year.
Connecting traffic accounts for one third of passengers at Heathrow. At Gatwick, this number stands at less than 10%.
70% of passengers using Gatwick originate from within the UK, and 40% passengers using Heathrow are Britons.
Where do they go? What airlines do they prefer. Here are four charts from 2014 that tell us this. anna.aero crunched some numbers for us.
Top 15 airlines at Heathrow by passenger seats where British Airways dominates the flight path
British Airways most popular with Heathrow passengers
Top 15 Airlines at Gatwick in 2014. Easy Jet operates almost a fifth of flights out.
Where do they go? Data for 2014 shows that passengers flying out of Heathrow favored the United States over domestic travel.
Most popular destination for Gatwick passengers? Spain
Those who flew via Gatwick left for sunnier climes of Spain, the most popular destination in 2014.