“JetBlue argues that because JetBlue’s manual contains a § 121.709(e) authorization, the AMM [Aircraft Maintenance Log] reference provision is inapplicable. … JetBlue would have the court interpret § 121.709(e) as exempting JetBlue from following its own procedures. But FARs do not negate compliant rules air carriers place on themselves via their maintenance manuals. In fact, C.F.R. § 121.709(b)(1) explicitly states that aircraft maintenance logs must ‘be prepared in accordance with the carrier’s maintenance manual,'” wrote U.S. District Judge Indira Talwani for the District of Massachusetts.