<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt">The sceptic in me wonders whether certain countries will allow them to enter their "soverei<span class="tab"></span>gn airspace" or just shoot them down as "foreign spy craft".<br><br>According to wikipedia there is no international agreement on how high above ground national airspace extends but the lowest suggestions are 20-30km, which is roughly the altitude the "loons" fly at.<br><br><br>regards,<br>Tony.<br></div></body></html>