“A one-way journey into history” – Metaphor (suggests the pilot’s expected fate of dying in war and being remembered as a hero)
“Little fishing boats strung out like bunting” – Simile (contrasts war with the beauty of nature, symbolizing a joyful life he doesn’t want to leave)
“He must have wondered which had been the better way to die.” – Irony (though he physically survives, he is socially ‘dead’ due to his family’s rejection)