> the solution suggested of giving the 3 companies other unused prefixes like D* U* and A* to use with their codeshares That would have the additional benefit

> the solution suggested of giving the 3 companies other unused prefixes like D* U* and A* to use with their codeshares That would have the additional benefit of being able to tell at first glance if your flight is actually flown by the airline you are booking or by someone else. But I'm not sure airlines actually want this to be that obvious...