The list is topped by London's Heathrow airport with a connectivity index score of 333. Chicago O'Hare (score of 306) and Frankfurt (score of 302) airports are at the second and third places, respectively.
The score of Delhi airport stood at 168 while that of Mumbai was 127.
In the Asia Pacific region, Delhi airport is at the ninth spot, as per the report.
Delhi and Mumbai aerodromes also feature in the list of 25 low-cost international megahubs. In this list, Delhi is ranked 6th and Mumbai placed at 14th spot.
At Delhi airport, the "dominant carrier" is IndiGo while it is Jet Airways at Mumbai aerodrome, the report said.
The OAG said the index reveals the 50 most internationally connected airports in the world. The index is generated by comparing the number of scheduled connections to and from international flights with the number of destinations served from the airport.
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