http://ir.bristowgroup.com/mobile.view?c=91226&v=203&d=1&id=2331510
"Operating revenue increased in the December 2017 quarter primarily due to an increase from our fixed wing operations as Airnorth contributed $21.0 million and $18.7 million in operating revenue for the December 2017 quarter and December 2016 quarter, respectively.
Operating loss, operating margin, adjusted EBITDA and adjusted EBITDA margin improved in the December 2017 quarter primarily due to a benefit to rent expense of $6.0 million recorded in the December 2017 quarter related to the OEM cost recoveries and the increase in operating revenue discussed above. Airnorth contributed $2.2 million and $1.1 million in adjusted EBITDA for the December 2017 quarter and December 2016 quarter, respectively.:
Maybe they improved income by minimising pilot numbers?