Commentary Par XV 81

The phrase 'pennuti in ali' (feathered wings) picks up (from verse 54 ['vestì le piume'] and verse 72 ['crescer l'ali']) to make this one of the densest insistences on Dante's heavenly flight in the poem.  See Shankland's two studies (Shan.1975.1; Shan.1977.1) for discussion of the pun on the poet's surname (Alighieri) available in the Latin adjective for 'winged,' aliger.