If you’re having a problem with the tickets collecting when you’re out of the game, or in general. Contact EA.
And for those on Kindle here’s a fix from Ydouneedtoknow for the timer restarting:
On kindle hard close kindle. Start again. Open tsto. Keep game open until first 20 min cycle completes. Stay in your Springfield. Keep it active . Do not visit krusty land. Do not visit neighbors. This fixed it permanently for me. Only have a Kindle to check it on though.
Hey Howdy Hey Tappers!
The Around the World event hit our pocket-sized Springfields the other day and it’s already causing a world of confusion! What’s the deal with the flights? How long do I have to wait? How do I add more runway pieces? I want a bigger airport!
Well don’t sweat it, we’re here (as always) to break it all down for you step by step, piece by piece until the Osaka Flu slowly takes over Addicts HQ! So let’s get to work breaking it all down….
So after you’ve completed Around the World Part 3 Milhouse’s Uncle Norbert will come flying across your Screen in Springfield…
And he’ll bring you his Adventure tasks on his quest to find the Golden Train..
Basically complete Norbert’s Adventure tasks throughout the entire event to unlock the Golden Train.
Along the way you’ll earn a bunch of bonus event currency (up to 1500 bonus event currency/day) and send a few Springfielders on flights around the world!
A few basics…
What Time Do My Tasks Reset Each Day?
Norbert’s tasks reset at 0800 GMT each day (3am Eastern time US).
How Do I Complete the Task? Where Do I Find the Task?
In the adventure section of your event hub, icon looks like this 
This clue is Find a Huge Horse from West Asia.
To complete the clue go to your Airport (or hit Do it) and select the character that’s making a trip to a location that best resembles this clue:
This picture was taken when the event first launched, you’re given a batch of free tickets initially (which is why the count is high), to run the first set of flights.
In this case the answer (A huge horse from West Asia) is sending Booberlla to Troy, Turkey. Sending her on that flight (4hr task) will complete that part of the daily task for Norbert.
Should I Send The Other Characters On Tasks as Well?
Yes. As Patric broke down in the Math post you absolutely should send as many characters as you can on flights to earn as much event currency as you can every 4hrs.
What’s the Deal with the Plane Tickets? How Do I Get More? What’s the Max? How Often Do they Appear?
So to send a character on a flight you’ll need 1 plane ticket per character to travel to that location. 
To earn plane tickets you really don’t have to do anything. Your game will automatically accumulate them for you.
You’ll earn 1 plane ticket every 20 minutes (this was changed from 2 minutes today (2/2/17)), with a max of 3 allowed at once.
Once you send a character on a trip, and use one of those 3, your game will automatically start working towards accumulating another ticket.
What’s the Deal with Norbert’s Task in my Task Bar? The Mysterious Globe.
This is a task where at the end you’ll earn a globe
Complete 7 full daily tasks (3/day..) to earn the Globe. And there are more prizes to come!
What Happens When I Complete All Three Tasks? What’s the Lost Luggage?
After you’ve completed all three of Norbert’s Adventure Tasks, you’ll unlock a chance to open the Lost Luggage Mystery Box. Here is where you can earn more Airport parts, runway tiles and even free land!
More more on the Lost Luggage Mystery Box check out this video I did on it…
And that my friends concludes the info about Norbert’s Adventure tasks!
What are your thoughts on the tasks? Like the Lost Luggage Mystery Box? What have you won from it so far? Sound off in the comments below, you know we love hearing from you!