grammar - Fight 707 arrives at/in Washington D.C. in ten minutes

1. 
   

   Fight 707 arrives at Washington D.C. in ten minutes.

   
   


2. 
   

   Fight 707 arrives in Washington D.C. in ten minutes.

   
   

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Do we have to use 'at' or 'in' in this case? Washington D.C. is a big city, so we have to use 'in' normally. However, because the plane leaves the city soon, the city can be a particular point on a map. So, can we use 'at' in this case?