From the Bristow 10K SEC Filing
Airnorth contributed $17.2 million in operating revenue for both the March 2018 and 2017 quarters, and a negative $1.4 million and a negative $0.7 million in adjusted EBITDA for the March 2018 and 2017 quarters,
Airnorth also has $13m+ of debt. 4x leased EMB170s and a few turboprops that are old and not earning any serious revenue. Not sure where TL is going but I bet that Bristow regrets paying $30m + to buy it in early 2015.