Theres a new helicopter airline in Cambodia, called Sokha airline, but its a bit more expensive than it used to be. $700 one way to Sihanoukville, $2500 to Bokor mountain.
www.etravelblackboardasia.com/article.asp?id=48303&nav=109

Hankor #19, your argument isn't very catching: The carbon footprint of any international flight (in fact ANY flight using an airplane) is offsettable for a fraction of the cost of the price of the ticketby either buying carbon emission rights in the European Union (see for instance this website) or by investing an amount of money proportional to the caused pollution in companies who, with that money, finance carbon-reducing counter-measures which compensate the amount of CO2 emmitted (see for instace atmosfair). Using a full or nearly full airplane, this is pretty affordable, even on long-distance flights: On a return flight Amsterdam-Bangkok, using a Boeing 747, I alone produce 6660kg of CO2. Compensating that costs me 135€.
A helicopter, by comparison, carries far less people and also emits far more CO2, which is the reason why the carbon footprint of these mashines is much larger. Sure you could also offset that, but for one thing, relative to the price of the ticket, this would be quite expensive and moreover, I just do not see a lot of sense in using a helicopter where it's not absolutely necessary, ie. on a short overland-distance where you could also use a bus, a taxi a boat or even a regular plane!

I followed the links to Sokha that Grooger posted and noticed they fly R44s which I think is powered by an internal combustion engine and therefore much cheaper to operate, costs probably of a couple three hundred per hour plus profit, I’ll bet that’s the $700 Siahnoukville flight. I think one of those aircraft flies out of our local airport, very unusual sound, you can hear the blades and also the pistons firing.
The carbon footprint of the R44 is probably small, like an SUV. That AS350,,,, well,, more likely a gallon a minute.
Despite the best maintenance available and skilled pilots a helicopter is still a helicopter. Typically insurance is very high and 10% deductible, often through Loyds or others used to insuring high risk expensive things.
I only spent a short time as a tourist in Cambodia 95 or 94, Grooger things have changed? No more roadblocks to pay toll?
The carbon emitted in the form of cow farts over the average life of a cow exceeds the carbon emissions of a single helicopter ride from Phnom Penh to Siem Reap. So the responsible traveler can offset the carbon footprint of his helicopter ride to Siem Reap by first blowing up a cow down at the gun range in Phnom Penh. Or so I hear.

I am so bored with this carbon footprint fashion.
Go scream on an Al Gore website!
I love choppers ,boats, planes,trains and motos!
And now I really dig cow farts!!
Thanks Fools
OH, AND ALWAYS LEAVE YOUR CARBON FOOTPRINT AT THE DOOR BEFORE YOU ENTER A PAGODA!!!
Yes, well Ive bought shares in a company that shoves carbon dioxide into mine shafts, so I can fly around in as many helicopters as I like. What a load of toss.

The OP wants a helicopter from SR to PP. He cant take a military helicopter now so why mention it?
Maybe you could buy a book and read about Cambodian history.
It's not in the history books for the most part. If you want to read about the military helicopter rides and other touristy happenings of that era in Cambodia, you come to a board like this where you can find people who were there and/or have access to obscure articles and writings about it. What your bitch? Nothing to add?
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<hr>why mention it?<hr></blockquote>
Why not? Are you afraid that the Thorn Tree will break down just because a few posts mention something that happened in the past? Besides, there is information on current helicopter flights.
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<hr>Maybe you could buy a book and read about Cambodian history. <hr></blockquote>
Maybe I have already bought about 50 books about Cambodian history, and none of them had the above information.