[LE BOURGET, France] The next generation of in-flight entertainment will include screens that know when you've fallen asleep, while new apps will very soon let you sync your personal devices with the onboard system.
At the Paris Air Show this week French manufacturer Thales has been showing off its prototype for the next generation of business class seat, which includes iris-tracking to tell when passengers are looking away.
The screen can be set to pause a film or go into standby when the passenger's eyes are closed, and restart automatically when they wake up.
"The eye-tracking technology actually came from the handicapped market, and we've reapplied it to airlines," said Brett Bleacher, director of innovations for Thales.
Mr Bleacher said it was "still five to 10 years off" before the technology is actually installed in business class cabins.
"We are just starting to build relationships with airliners to get this into production," he said.
Meanwhile, the market leader in in-flight entertainment, Panasonic, was displaying its own technological innovations.
Having already brought touch screens and high-definition video to many major airlines in the last couple of years, the Japanese company is now offering a range of smarter software that allows passengers to browse the films on offer from an app on their personal device before they travel, and then sync the device once onboard.
Marketing manager Mario Grima said the software would be introduced to airliners "very soon".
The sync means passengers can use their iPad or tablet as a second screen, browsing the Internet and shopping options without interrupting the film - part of the growing "bring your own" trend to in-flight entertainment.
It has taken a while for airplane screens to catch up with the sort of quality that have become routine in smartphones and tablets.
"Airline screens have to go through a lot of certification and testing. They have to be much more rugged to make sure nothing goes wrong," said Mr Grima.
"If your iPad bursts into the flames on the ground it's not the end of the world, but if that happens on a plane, it's obviously much more of a problem."
Companies including Panasonic and Thales also have to "future-proof" their computers to make sure that they can handle technology and software improvements.
"You don't want to change the entire fleet's entertainment system every time some new software comes out, so we've had to make these much more powerful than an iPad," said Mr Grima.
It's paying off, with the in-flight entertainment sector growing even faster - around 10 per cent per year, says Thales - than the rest of the booming air industry.
The latest entrant into the market is Zodiac Aerospace, which has come up with a low-cost tablet that can be plugged into each seat with its own memory card.
That removes the need for big servers and distribution boxes on the plane, and means each one can be easily replaced.
"We've been able to enter the sector even though there are two big players without enormous investments because the technology has changed," said Yannick Assouad, Zodiac's director of aircraft systems.
Airlines are also keen to encourage more spending from passengers by booking hotels, hiring cars or buying tickets from partner companies at the destination - an increasingly important development as profit margins are squeezed.
"Ancillary revenue from selling tickets or teaming up with hotels and rental companies has become a huge and growing part of airline revenue," said Scott Easterling, director of in-flight entertainment for Thales.
The new technology allows airlines to gather large amounts of commercial data on passengers, from what time they do the most shopping to what kind of products they favour.
And there are more practical uses to the increasing connectivity, too, with airlines able to send information from the plane to maintenance crews at the destination, informing them of malfunctions so they can be ready with the correct parts and crew as soon as the plane arrives.
"Now that we have this really good permanent connection to the ground, we can do all sorts of things - we are only just scraping the surface," said Mr Easterling.