There are currently two tags with the same meaning, with most questions belonging to the former: aircraft-identification and aircraft-recognition. One of the few questions in the latter category is tagged with both.
Since no one has answered, I'll make my comment into an answer :-)
Yes, I think they should be merged as proposed. Identification is the appropriate word in English therefore it should be the main tag. Recognition is fine as a synonym; it may be the word that some non-native English speakers think of first.