The regional market and scope clauses

Union contract Scope Clauses–the provision limiting the weight, capacity or number of aircraft operated by airlines for majopr carriers–are unlikely to be modified any time soon, panelists at the Air Finance Journal conference in Dublin said.

The restrictive Scope Clauses are predominate in the US. These limit the ability of small airplane manufacturers to sell aircraft in the US. Most affected are Embraer, Bombardier and newcomer Mitsubish…

https://leehamnews.com/2017/01/18/regional-market-scope-clauses/