It isn’t explicitly titled as “furlough protection,” but the CARES Act as passed by the Senate states that airlines receiving aid “must agree to refrain from conducting involuntary furloughs and reducing rates and benefits until Sept. 30, 2020.” I would assume that this language will be substantially the same in the House version, as well as in the merged bill.

Source: https://www.kramerlevin.com/en/persp...by-senate.html

Full text of the legislation: https://www.npr.org/2020/03/25/82075...us-relief-bill