https://www.iaa.de/en/flixbus/

Take the FlixBus or FlixTrain to the IAA 2018

Enjoy reduced-price tickets for the FlixBus or FlixTrain to the IAA Commercial Vehicles! IAA ticket holders can now save 10% on their journey to Hannover. To receive your personal voucher code for FlixBus or FlixTrain, you need only your personal ticket number, e.g. 0049 8 8 05 0000001 8. You will find it on the right-hand side of your admission ticket.

Enter this number – without the spaces – here.
You will be sent your individual voucher code for FlixBus or FlixTrain.

You can now use the voucher the next time you book online using the FlixBus App. Install the app and then choose when you want to travel. The shopping cart will show the field “Voucher”. Enter your code and click on the “Redeem voucher” button. Click on “Book now” to purchase your ticket with a 10% saving. Then all you have to do is board your bus at one of the over 1,700 bus-stops in Europe and the US, or your train between Cologne and Hamburg or between Stuttgart and Berlin, sit back and relax.
 
Conditions of use:
Vouchers may not be combined with other vouchers and can be redeemed only using the app. Vouchers cannot be redeemed for cash or applied retrospectively to orders already placed; they are not transferable and may not be resold.