Possible Clues:

• Fly people or goods out, in emergencies perhaps
• Helicopter rescue, say
• Operation to shift people and supplies with planes or helicopters
• Emergency procedure if trial goes wrong
• Aerial transport
• Emergency evacuation
• Barnet's gone flat? You should 'ave this emergency action
• Fly people and goods to places not otherwise accessible
• Emergency transport from trial if in order
• With 50% off, Trailfinders've arranged saving on flight?