The idea to retaliate tit for tat has been mooted for US registered aircraft to be "blackballed" and ground staff to refuse to handle them until the US co-operates with the visa/immigration system.
The USA will not be happy until our airlines are sinking in the same pond of stagnation that their Big 5 have found themselves in!
Unfortunately, if we go down the route of "blackballing" US aircraft, one or two of their carriers would definitely go under - and we would be reluctant to bring redundancy on fellow airline personnel.
Mind you, if we sit and do nothing, the US government will gloat as British Airways profits, once again, are eroded through their stupidity!
Perhaps, the right course of action would be yet another delegation to the House of Commons demanding our respective MP's take up the cudgels on our behalf!