Air
Is freight shipped on certified air carriers?
I’m looking at some statistics for air freight traffic and air traffic is differentiated into general aviation and certified route air carriers. I was wondering whether most air freight is shipped using certified route air carriers, or whether a significant portion is shipped using general aviation. (I’m trying to determine fuel efficiency for air freight, so any info on that would be helpful too.)
Thanks for the answer–would UPS or FedEx be considered a certified Carrier as well?
I am not exactly clear on what you mean by a certified route air carrier, but as to fuel efficiency, or overall efficiency there are several things going on behind the scenes. You are already aware of the major carriers of parcels (FedEx,UPS) then there were Airborne Express, DHL, Purolator,Burlington, etc… these were actual companies with their own leased/purchased aircraft that flew their own routes etc. There were smaller companies such as Emery or Fine Air that would work under another companies FAA Approved certificate and have their crews provided by someone else (Rosenbalm). You see this a Lot in freight Heavy areas such as around Miami where material comes into the country and is dispersed from that point. Then there are freight forwarders that work simply off of discounted rate from the main carriers themselves.
PILOT Airfreight for example, would contract to ship so much per month/quarter/year… whatever… and they would in turn get a discount from the carrier…so the little leased van would drive out to your place and pickup your boxes, and then take them to the UPS terminal where they would be shipped to a holding point and a Pilot van there would go get it and deliver it. By doing this, the main carriers keep their airplanes Full (because discounted freight would be bumped in favor of full Price freight) and while not as profitable as carrying through their Mainline, they helped defer costs which is what it is All about in this business.
The freight business is extremely competitive, and contracts come and go with the wind. Not delivering on time, or misconnecting freight, Shipping to the wrong city, or worst of all, losing the freight… and I have seen contracts change twice in 10 days. Pilots are required to Fly in conditions that push the limits of the rules, and quite commonly push well past the limits, but when they said “It has to be there positively” it means that you know the law of averages is going to put you in a bad position eventually. The smaller the company, the More dependent it becomes on keeping a customer happy, as the loss of a Single contract could be enough to close down the whole operation.
Your question about significant amount shipped using general aviation, I take that to mean Part 135 operators which fly non-scheduled (charter) trips as needed. Significant amounts… as in tons, no.. they can’t begin to compete with the Large carriers, but they provide for a niche market the “Hot shot” trips that are vital to industry. This applies often with the auto industry and you will see parts moved from Mexico thru the Usa to Canada for assembly Lines that must be kept running. Sometimes it is the Size of the door of the airplane that can accomodate certain objects that will determine the company that can provide the service. Still there are companies that operate large turboprop aircraft such as ZANTOP that move large amounts of freight each week but are in a more selective market (auto parts) than the main carriers.
Freight and mail is also moved on commerical passenger flights, but their rates are usually higher than dedicated freighters, but it is a method of getting things moved. You can even send something “counter to counter” on the airlines (or could previously may not be allowed now) but the cost was extremely High.
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Inflating an Air Mattress Bed – How Long Does it Take?
There are several ways of inflating an air mattress bed. You can inflate an air mattress either with an Electric driven air Pump or with a Manual Air Pump. Of course you also inflate it without using any Equipment but it would take virtually forever considering the effort it would take and the length of time you can sustain that effort.
Electric Air pumps and manual air pumps for air mattress beds have its own advantage and disadvantages depending on the application. Electric air pumps may not always be the Best choice if factors regarding the usage of your air mattress are considered.
Consider for example if you are in Camping spree and you bring along your air mattress bed or air mattress mat. Camping almost always guarantees that there are no electric Power in the vicinity, unless of course if you’re camping in your backyard. The best air pump to consider in this situation is a manual air pump for your mattress.
Types of manual air mattress pumps:
1. Hand operated
2. Foot operated
Both of these types require you to ‘push and pull’ or ‘push and Release‘ depending on the Design. Some air pumps are designed are able to push air into the air mattress in both ways, so it would be a better choice since every time you push, your mattress will inflate and every time you pull, your mattress will also inflate.
Electric air pumps for air mattresses:
If your air mattress is permanently situated in your house or if you have a camping mattress and use it Only when you are near your Car, then an electric driven air mattress pump can come in Very handy and convenient.
Some electric air pumps come with a rechargeable Battery so that when there is an electric failure, you can still use it to inflate your air mattress bed. These models can also be plugged to the cigarette lighter of you car, a very good option when you frequent outdoors using your air mattress bed.
How long it takes to inflate an air mattress bed depends on several factors. One of which is the size of the air mattress bed or mat. The other is the capacity of the electric air pump as to how many cubic feet of air it can generate per minute. Check the electric air pump specification for this value. The higher the value, the faster it would take the air mattress to inflate.
For example if you have a twin sized mattress 39″ X 74″ with a height of 8″, you can calculate the amount of time it will take to inflate the air mattress by multiplying those figures then dividing it by 144 to calculate the volume of the air mattress in cubic feet. If your electric air pump can inflate your air mattress with 18 cu. ft. per minute, simply divide the volume of the mattress with the capacity of the air pump. In this example, it would be ((39X74X8) / 144)/18 = 8.9 minutes to fill that air mattress size. Air mattress mats can be inflated a lot faster because its height can be less than 2 inches. Other electric air pumps can inflate air mattresses in 27 cu. ft. per minute which gives a faster inflation time.
The actual time it would inflate a mattress using an electric pump is a lot faster since air mattresses are not all hollow inside. There are air compartments inside designed to give the utmost comfort in your sleep so the actual air volume needed to inflate the mattress is minus the volume of the materials inside. Usually air mattresses can be inflated in a minute or Two.
When buying air pumps for your mattress, choose the one which best fit your needs.
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