aër

thumb|300px|Aër covering a Chalice and Diskos on the Prothesis (altar)|Prothesis

The Aër (, ; ; Slavonic: Воздýхъ, Vozdúkh) is the largest and outermost of the veils covering the Chalice and Diskos (paten) in the Eastern Orthodox Church and the Eastern Catholic Churches which follow the Byzantine Rite. It is rectangular in shape and corresponds to the veil used to cover the chalice and paten in the Latin liturgical rites, but is larger. It is often made of the same material and color as the vestments of the officiating priest, and often has a fringe going all the way around its edge. Tassels may also be sewn at each of the corners.