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In new google map there are several travel mode like driving, bicycling, walking and transit but they also added fly mode also. I can choose fly mode in new google map but i cant get fly travel mode in google maps v3 api. I want to to show fly distance between two cities on my site like google map shows on google map.

http://maps.googleapis.com/maps/api/directions/xml?sensor=false&origin=Lahore&destination=Multan&mode=driving

$base_url = 'http://maps.googleapis.com/maps/api/directions/xml?sensor=false';
$xml = simplexml_load_file("$base_url&origin=Lahore&destination=Multan");
echo $distance = (string)$xml->route->leg->distance->text;
echo $duration = (string)$xml->route->leg->duration->text

driving, walking and other modes are working but fly is not working.

I've never used this API before and this might sound really really dumb, but have you tried using the keyword "flying" instead of "fly"? (Since you're also talking about driving, walking)

yes i tried flying as well as flight but no result.