UPS, flight dispatchers reach impasse, union says - Louisville Business Journal Unionized aircraft dispatchers say they've reached an impasse in negotiations with United Parcel Service Inc. The two sides have been engaged in federally mediated negotiations for a new contract since August 2016. The dispatchers are part of the Transport Workers Union of America. Because this negotiation is being overseen by the National Mediation Board, neither UPS nor the union can walk away. So TWU has sent a request to the board requesting to be released from negotiations. TWU and UPS could not reach an agreement because UPS has not offered enough in wages and their pension proposal falls significantly short when compared to other unionized UPS airside workgroups, a union news release said.