mychurch wrote:JamieBahrain wrote:What’s the risk on the jet for old wine ? Or just worried of handling issues and temperature variations ?
Jamie. I’d be worried about the handling and the pressure.
Either way, if the pressure can pop those bags, then I’d be worried by how old, saturated corks would react.
Hi mychurch,
Very reasonable concerns. I was interested if you had any experiences as there's more anecdotal evidence than science ( though changing ). Living in Hong Kong amongst high-end collectors many refuse to use air freight.
Personally, I move about 400 bottles a year on aeroplanes in checked in luggage. Generally 24 bottles per trip with family and friends assisting as well . I also use air freight very cautiously for reasons to follow.
A jet airliner will be pressurised to between 5000 and a smidgen over 8000 feet on a long flight from European wine regions ( with a fuel stop between Euro & Oz ).
Initially, a fuel laden aircraft, will be pressurised to the lower figure, as fuel burns off and the aircraft lightens, it will climb to higher altitudes and the higher figures result. Temperature variation is possibly significant depending on the aircraft, depending on where the luggage stored and depending upon equipment serviceability. Now it is not uncommon for cargo heating to be unserviceable. This of course is very serious pre-flight and crew will be ensure there are no animals or temperature critical dangerous goods in cargo- wine in luggage is obviously not considered. This is where you may see temperatures below zero and the effects on arriving luggage ( external frosting ) especially if in a small bulk cargo hold at the rear which won't ( aircraft dependant ) see re-cicrculated warm cabin air.
Now I'm sure there's an audience here whose practical chemistry and application of Boyle's gas laws better than mine. The following from conversations with collectors with doctorates in chemistry, vague online studies and other more academic crew. So no google supported nitpicking thanks.
At 8000 feet cabin altitude when you are in cruise air will be expelled from the wine. When the aircraft starts to depressurise air will be drawn back in. Temperature is a factor now due oxygen solubility and here's where the failed heating or naturally cooler cargo spaces of aircraft come to play. Oxygen solubility is double to triple - depending on how cold it is- and oxygen will now dissolve into the wine.
Wine air freighted too, in a recent study, shows less free sulphur dioxide and spectral analysis shows more browning due oxygen absorption in flight. How does this affect ageing through possible accelerated oxidation? My guess is it depends on the extremities experienced and number of pressurisations.
So we have a little bit of science and a lot of anecdotal argument on pressurisation factors. I'd be concerned with a very old bottle like you.
Now the biggie. Temperature variation! Insulate, insulate, insulate! This is from extensive experience and using temperature recordings inside suitcases. I'm OK on a flight from HKG using styrofoam boxes which don't have the layered protection of suitcases.
A flight from Europe with an Arab or Asian airline will fuel-stop somewhere very, very hot. Tarmac temperatures are massively hotter than ambient air temperature. So if you change aircraft you have more variation. Even if you don't we tend to shut down our APU supported a/c and ever unreliable ground air is connected. All this temperature variation will accentuate the science above.
Cargo aircraft are often unreliable mechanically and without schedule regimentations. Often departing very late you must, for protection, have wine included as a perishable freight and most retailers DO NOT pay for this service. I use my own airline which does ( the ladies in Milan love Barbera so my freight treated like a million dollar racehorse ). I have refused wine from the UK that's been airfreighted. So as a general rule- NO.
Hope this helps a little.