That being said, I'm on Android and do use it to manage all my trip data. Prior to that, I was using various versions of Worldmate.
I do love the service. Their website design feels aged and worn, but the functionality is great. I love trying out confirmation emails from new travel services to see if they can parse them. And they usually do a good job.
They get given a key to act on your behalf they would never get your actual login details.
Click Analyze to see that I've flown 297 flights to 83 unique airports for a total of 539365 miles, which is 2.258x to the moon.
https://itunes.apple.com/us/app/google-trips-plan-your-trip/...
https://play.google.com/store/apps/details?id=com.google.and...
In all honesty, feel free to use something like Tripit — see my response to the parent.
It's not that I can't organize things myself, it's that it is nice when Inbox does it for me.