http://www.abc.net.au/news/2014-12-13/eagles-restrict-their-flights-to-home-ranges-finds-researcher/5959094

A researcher who found wedge-tailed eagles could soar to
extraordinary heights, has revealed the birds of prey stay within clearly
defined territorial areas or 'home ranges'. But a juvenile eagle will travel far
from the nest, with one clocking up 15,000 kilometres in a year as it flew
across Western Australia.

Simon Cherriman began tracking the movements of three eagles at Lorna Glen near
Wiluna in the Goldfields in 2013. He used GPS satellite transmitters which were
fitted to the backs of the birds. Earlier this year, the data showed that the
birds were flying at heights of up to 6.5 kilometres, possibly due to thermal
air currents in the region.

That's over 21,000 feet. Thanks to Richard.