Case T-375/15: Judgment of the General Court of 27 April 2017 — Germanwings v Commission (State aid — Aid for an airline using Zweibrücken airport — Benefit — Whether imputable to the State — Obligation to state reasons — Legitimate expectations — Access to documents — Documents relating to a procedure for reviewing State aid — Refusal to grant access to the documents requested — Exception relating to the protection of the purpose of inspections, investigations and audits)