1000 free airberlin Topbonus miles
Car rental provider Sixt and airberlin have teamed up (once again) to offer 1,000 free topbonus miles to anyone who registers with Sixt in June 2015, via this link.
Having successfully received these 1000 free topbonus miles in the past myself, it’s well worth spending the 10 seconds it takes to secure them.
As a related aside, airberlin is very soon set to release the latest round of topbonus “Topdeals” – where redemption flights with airberlin become available for as little as 2000 topbonus miles. We will post separately on this.