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They aren't much cheaper- Interwar fighters are treated as interceptors, so FTR 0 is the same as INT F 2. A marginal difference of 1 or 2 IC. Almost nothing.
Over the 150 days taken to build them a difference of 1 IC per day = 150 IC.
That's enough for...ok, not much, but it's still a saving. INT 0 also has a historical date 1 year before FIG 2, so you can get them into production sooner.