Case C-697/21: Order of the President of the Court of 5 January 2022 (request for a preliminary ruling from the Amtsgericht Düsseldorf — Germany) — PW v Eurowings GmbH (Air transport — Compensation to air passengers in the event of cancellation of flights — Means by which the cost of the ticket is reimbursed — Reimbursement by travel voucher — Request to be reimbursed in cash)