I experienced a huge failure of this program. My daughter, grandson and I arrived at FRA from Dubrovnik on Sept 12 on Croatia Airlines, a Star Alliance member, an hour late. We were due to connect to a United Airlines flight to Newark. After a bus ride, security visit, a train ride we still had a 27 minute walk to our departure gate (posted time) we hurried to our gate. Of course when we arrived our flight was long gone. The agent we were sent to was little help. We were presented with 3 choices.....the next flight in about 1 1/2 hours which would cost $300US each (I presume in Economy Plus). Or upgrade to Business class, cost $1000US each, or flight after that in about 6 hours to Dulles. No offer of food vouchers either, just a take it or leave it shrug. He said it was our fault we missed the flight we didn't hurry fast enough. Neither Croatia Airlines or United would take responsibility. Now I learn that Frankfurt airport has a Star Alliance program in effect to assist passengers connecting from late arriving flights. Some program, we didn't see any evidence of it.