and the one where download speeds are ridiculously slow
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London's airports have fared poorly in testing of their free wifi systems - with a new study revealing speeds are getting slower and still lag behind others around the world.
While Stansted ranked first in a recent study with a top speed of 6.4Mbps, finishing well ahead of its competitors, it was almost 10 times slower than some of the highest speeds seen in Europe and the US.
Gatwick's free public wifi fared the worst of the five airports included in the study with a speed of just 0.4Mbps, slightly slower than Luton and Heathrow.
The findings in the independent study by London-based Thinkbroadband.com will likely come as no surprise to passengers who were stymied by frustratingly slow speeds when they tried to download content before boarding.
(Photo: Thinkbroadband.com)
With these speeds it would take around 20 minutes to download a "high quality" 60-minute programme at Stansted.
At Gatwick the same download would take five hours to complete.
Thinkbroadband co-founder Seb Lahtinen told Mirror Online: "I wouldn't say that any of these speeds were good speeds. Generally speaking they are disappointing.
"What matters more to people who are flying is they want to download a TV show or film before a flight that they can watch on board the plane.
"Having fast wifi is important from that aspect. It should be a basic part of the airport experience."
During their travels Thinkbroadband staff have tested wifi speeds at airports around the world.
Mr Lahtinen said they found speeds of up to 60Mbps (megabits per second) in the US and up to 50Mbps at Helsinki's airport, although the latter has come down to around 20Mbps recently.
Airports tend to keep their free wifi at slower speeds to push passengers towards paid packages that offer faster and more reliable service.
(Photo: Getty Images)
Tests conducted last November revealed that the free wifi services at all but one of London's five major airports were worse than the previous year, while the other one showed no change.
Stansted's speed of 6.4Mbps was down from 8.1Mbps in 2015, although it has extended its free usage from one to four hours, while London City , which was second at 2.7Mbps, was down from 4.5Mbps.
Heathrow was third with a speed of 1Mbps, which was unchanged from 2015.
Luton , however, saw a dramatic decrease from 4.5Mbps in 2015 to 0.9Mbps in 2016.
Gatwick saw a slight decrease, from a measly 0.5Mbps to 0.4Mbps.
By comparison the average broadband speed at home is 25Mbps, said Mr Lahtinen.
The team from Thinkbroadband spent around an hour in each airport, carrying out about two dozen tests in each one.
They checked wifi speeds in multiple locations using laptop and tablet computers and smartphones.
Mr Lahtinen said: "More and more people are relying on broadband to do their work or to download a show before a flight.
"I work remotely most of the time so faster broadband speeds are very important to me."
The study didn't analyse separate wifi services offered by lounges, restaurants or shops, which usually require a first or business class ticket or payment.
There are ways to get faster wifi without having to pay a fee or for a service or meal.
At Heathrow, for example, passengers have access to a faster 3Mbps service if they log in using their Twitter account or sign up to its rewards scheme.
Mirror Online has contacted the airports for comment.