Possible Clues:

• Provides guidance for flighty types in part of the book covering one Biblical figure
• Test for precious material and energy with fee for looking after Jumbo
• Navigation chart describing island span
• Air-traffic control attendant smuggling one parcel
• In polite exchange, silver as fee for guide
• One group wants attendant around to provide guidance
• Guidance provided by smug group over time
• (Fee for) bringing a ship into harbour
• Many having really good time going about flying plane
• Guidance shown by religious clique over time