Air Canada
When an Air Canada 767 ran out of fuel near winnepeg in the early eighties it became the worlds largest glider...... everyone survived though.
How do you think they lost the height to bring her down to a disused air force base? They side-slipped her several times, the guy was a keen glider pilot apparently.
Whilst it is not a normal technique they are still aeroplanes and if needs must..... then slip away..... I'd much prefer to just do an orbit though.