title: Which aws database should I use?
body: <p>I have a legacy project that I like to migrate piece by piece. Now, the data is tightly connected.</p>
  
  <p>For example:</p>
  
  <ul>
  <li>Flight information</li>
  <li>Crew info</li>
  <li>Passengers info</li>
  <li>Airports</li>
  <li>Flights can have many airports too</li>
  </ul>
  
  <p>I also would like to have the database that is scaleable and flexible in changing structure. I’m using AWS.</p>
  
  <p>I had a look at DynamoDB, it has the flexibility that I’m looking for but when I found it’s hard to query a particular single item in 1-to-many for example.</p>
  
  <p>I also know how inflexible it is to change structure or schema in RDS.</p>
  
  <p>Any suggestions? </p>