Any payment of state aid to help airlines would be by mutual agreement by member states, and done on a level playing field basis, he said. (breakingtravelnews.com)
There shall be one arbitrator, and such arbitrator shall be chosen by mutual agreement of the parties in accordance with AAA rules. (cosmolex.com)
Often a discount, if any, is arrived at by mutual agreement between the parties. (remonline.com)