BRUSSELS (Reuters) – Lufthansa , United Airlines and Air Canada are set to secure EU antitrust approval for their tie-up after agreeing to cede slots at Frankfurt and New York airports to rivals, a person familiar with the matter said on Wednesday. The three airlines made the offer following a three-year-long investigation by the European Commission into their revenue-sharing, pricing and capacity pacts as part of their Star Alliance network. The EU antitrust authority sought feedback from rivals and third parties in December last year. …