The following website gives details of Romain Gary's WW2 service and life outside WW2. It is in French, but Google translates it correctly in English.
https://www.ordredelaliberation.fr/f...75/romain-gary
It confirms that he was part of the Topic bombing group, one of the first Free French air units, when he went to Africa in fall 1940, but gives no detail if and when he flew in operations.