The US Transportation Security Administration (
TSA) runs a program called Precheck. It is very pleasant for travelers. Their security check is like it was before 9/11. There is no need to remove shoes, laptops, 3-1-1 liquids, belts or light jackets. And the lines are short.
Known Traveler Number
Americans can buy Precheck membership for $85 for 5 years after they have been screened and have had a background interview. Once approved, they will receive a “Known Traveler Number” that they can include in their airline reservations.
After 5 years you can...
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About 1/3 of travelers are not very concerned about their security when they are online at airports or in planes. Some 9% confess they never thought about their online security, while almost 25% say they are not at all concerned about Wi-Fi security.
However, 48% of respondents admit they do have concerns that distress them somewhat. And 19% even say they are very concerned about potential breaches.
Ryanair
Passengers want:
* Their bags tracked throughout their journey
* Watch digital content on a seatback device
* A human touch when things go wrong
* Automation of more airport processes
* Biometric identification to facilitate their travel processes
* Real time journey information delivered to their personal devices
* Wait times of less than 10 minutes at security/immigration
In the UK, about 1.3 million passenger journeys were delayed by at least 3 hours last year. This concludes 
Numerous studies have been made of the boarding process. Not only airlines have looked at possibilities for improvements, but also scientists. Interestingly, many carriers change the boarding processes every now and then, but they never really improve it.
Passengers in economy class have very little personal space and can hardly move and breathe once they have squeezed themselves into narrow seats. They have also hardly legroom due to the very short pitch (distance between rows). Thus, one would expect that passengers would prefer to board as late as possible. 
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