A traveler flying over India observed the natural vegetation landscape change below in the sequential order of: tropical evergreen forest, savanna, dry deciduous forest, and desert/scrub. His flight path was most likely from:

This trans-subcontinental vegetation sequence matches a flight path from Trivandrum to Delhi. Starting from the wet equatorial southern coast of Kerala (tropical evergreen forests), the path crosses the semi-arid rain-shadow plateau regions of the Deccan (savanna/scrub zones), passes through central plains (dry deciduous forests), and approaches northern arid boundaries near Delhi.