defence aircraft have a variety of self defence systems which the charter aircraft defence systems which the charter aircraft and other aircraft coming in that aircraft and other aircraft coming in that do aircraft and other aircraft coming in that do not have those systems. we look in that do not have those systems. we look very carefully at the approach pattern and the departure pattern approach pattern and the departure pattern of approach pattern and the departure pattern of that runway to see if we see any pattern of that runway to see if we see any sign of something that might pose a see any sign of something that might pose a threat to aircraft. that s one of pose a threat to aircraft. that s one of the pose a threat to aircraft. that s one of the things we look at religiously throughout the day and throughout the night as we conduct operations. it s the only way we look operations. it s the only way we look at operations. it s the only way we look at people