Possible Clues:

• Retired head plugging bleepers for travellers?
• Being carried, go by the hidden greens
• First part of an erroneous 'Christian Science Monitor' headline published on April 15, 1912
• Travellers
• People on buses perhaps see prangs developing and start to shout
• Goes around North with German travellers
• Travellers on a bus, etc
• Weak team members who'll get transferred by coach, perhaps
• Fares going up on flights?
• Step outside steamship with awfully green travellers