sky marshal(n = noun.person) air marshal - a person trained by the government in hijacking and terrorist tactics who (for security reasons) is a passenger aboard an airline flight;
is a kind of marshal, marshall

air marshal, blue sky, blue sky law, earl marshal, field marshal, fire marshal, knight marshal, lucy in the sky with diamonds, mackerel sky, marshal, marshal saxe, marshal tito, provost marshal, sky, sky blue, sky burial, sky dive, sky glow, sky pilot, sky wave