Airberlin has changed the number of flights required for Topbonus Silver status that maps to Oneworld Ruby from 24 to 30.
Topbonus recently expanded the fare types that qualify towards the status by including Light-fares effective March 1, 2017 (read more here).
You can access Airberlin’s page for elite benefits here.
Here are Topbonus Silver benefits:
The “real” benefits usually start at the Oneworld Sapphire level which maps to Topbonus Gold, and includes business class lounge access and extra baggage allowances.
Topbonus Silver members are eligible for certain benefits such as priority check in, priority security and free seat reservation.