CSeries dumping petition by Boeing
On 28 April 2016, Bombardier Aerospace recorded a firm order from Delta Air Lines for 75 CSeries CS100s plus 50 options. On 27 April 2017, The Boeing Company filed a petition for dumping them at $19.6m each, below their $33.2m production cost.
Source: Wikipedia — CSeries dumping petition by Boeing (CC BY-SA 4.0)