Related Clues:

• They steer ships in and out of harbours
• Good many become Guides
• Ones doing loops and barrel rolls
• Delta force?
• TV test episodes
• Some American workers
• First episodes with spoilt models
• Their prospects are up in the air
• 'This is your captain speaking' speakers
• Fliers of jets
• Flies, as a jet
• They work in lofty places