1. the cost of return transport to airport is the price of the transportation you take to get back to the airport
2. the cost of transport to the airport/car parking at the airport is the price it costs for the transportation you take to get there
3. price of local currency means how much it costs to convert the money
When the narrator shines the single beam of light on the old man's eye, that left a picture of the situation for me.
Another is when the narrator is hearing the heartbeat from under his floorboards and pacing around the room, growing more and more agitated until he finally confesses to the murder.