Following the Fall of the Berlin Wall on 9 November 1989 and the subsequent political changes in East Germany, several foreign airlines expressed intentions to take over parts of the highly unprofitable company, in order to get a grip on the German air traffic market, especially concerning Berlin. In early March 1990, Lufthansa signed a letter of intent to acquire 26 percent in Interflug, but the offer was blocked by the Federal Cartel Office. Plans for a take-over by British Airways did not materialize, either (instead, Deutsche BA was formed in 1992). On 1 July 1990, Interflug became a member of the International Air Transport Association (IATA).