Why have separate forms for international searches?

We’ve noticed something rather peculiar about most of India’s online travel sites–almost all of them have different search forms for domestic and international searches. They link these separate forms to each other as you can see from the image below.

We can’t figure this one out at all–why two separate search forms? The form fields that need to be filled out are identical for domestic and international searches, so why keep it one click away from users?

We’re scratching our heads over this one…

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