There is nothing wrong with airborne as a product. Their fault lied in violating DSHEA practices which state that a product cannot claim to cure, treat, or prevent any diseases.
Airborne said that it could prevent/cure the common cold (not sure which.) A supplement CANNOT say that and expect to survive. It just takes one person to say, "I took airborne, and I still got a cold," to ruin it for the company.
My store is in the same situation as methusaleh's, we took our display and moved in in the back, hasn't seen the light of day since. Currently isn't not even available on our website anymore either. Whoops.