Possible Clues:

• Annual movement from one place to another
• Periodic passage of animals
• Mass movement
• Russian aircraft with share of international travel?
• Russian fighter helping people moving
• Grit Naomi displayed in returning with Ruth
• Periodic movement of groups of animals
• Dutch instrumental duo who notched a UK No one in nineteen ninety four
• Am I to ring about popular trek?
• The movement of people or animals from one locality to another