swept-back 
adjective
(Of an aircraft wing) positioned to point somewhat backwards: a revolutionary type of aeroplane with swept-back wings swept-back handlebars...
- Both the BIB bomber and F - 14 fighter plane pivot their wings from outstretched to swept-back positions.
- Six Allison J35-2 turbojet engines slung in pods beneath the swept-back wings gave the prototype Stratojet nimble performance, and helped to validate a design concept still widely used today.
- The A380 can operate on existing runways because, with its swept-back wings, it takes up only slightly more space than a 747.