Looks like there's disambiguation between types of airports:

• https://taginfo.openstreetmap.org/keys/aerodrome%3Atype#values

Common values include:

We probably shouldn't include all these...

• public
• private
• military
• military/public
• civil
• gliding
• club
• heliport
• glider
• regional
• airstrip
• international
• abandoned
• altiport
• private/public
• military/private