I lived in Bolivia for 3 years and recruited from places higher than 11,000 ft elevation (La Paz)
I have also Logged in and game planned/recruited from all over the world:
Peru, Bolivia, Brazil, Guatemala, DR, Kenya, South Africa, Swaziland, India, Thailand, Korea, Laos and several others. (Not to mention the many airports in various countries) Actually, my best recruiting class came somewhere between Bangkok and Seoul.