The US Navy resumes operations of its fleet of Boeing T-45 Goshawk jet trainer aircraft which was grounded on 5 April due to the problems with the Onboard Oxygen Generation System (OBOGS). Although the root of the issues still remain unknown, the Commander Naval Air Forces said they have identified a way forward to resume flight operations safely by limiting the maximum cabin altitude to below 10,000 ft in order to be able to operate without using the OBOGS system. The navy emphasized that they will continue the engineering testing and analysis to identify the cause of the issues, which will be their top safety priority.