British Airways and Air Berlin will start codesharing on around 40 flights from early July.
BA customers can buy direct Air Berlin flights to Nuremburg, Munster and Paderborn through ba.com.
In addition, customers can use ba.com to book connecting flights on selcted routes from airberlin’s network, including main German gateways and other destinations such as Palermo and Brindisi.
Airberlin will join Oneworld in April 2012. Its entry is sponsored by BA.