The Law (Penalties) 49 USC Sec. 46312
The Regulations: 49 CFR 175 - Hazardous Materials on Aircraft
The Regulations: 49 CFR 173 - Empty Packagings
Notification At Airports
TDG HazMat News

Carrying Empty Fuel Bottles on Airplanes

Here is the text of the Federal (FAA) regulations governing taking empty
fuel bottles on Airplanes:
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49 CFR Ch. I (12-31-91 Edition)
sect. 173.29 Empty Packagings.
  (a) General.  Except as otherwise provided in this section, an empty
packaging containing only the residue of a hazardous material shall be
offered for transportation and transported in the same manner as when it
previously contained a greater quantity of that hazardous material.
  (b) Notwithstanding the requirements of paragraph (a) of this section,
an empty packaging is not subject to any other requirements of this sub-
chapter if it conforms to the following provisions:
   (1) Any hazardous material shipping name and identification number
markings, and any hazard warning labels or placards are removed, obliter-
ated, or securely covered in transportation.  This provision does not
apply to transporation in a transport vehicle or a freight container if
the packaging is not visible during transportation and the packaging is
loaded and unloaded by the shipper or consignee;
   (2) The packaging--
    (i) Is unused;
    (ii) Is sufficiently cleaned of residue and purged of vapors to remove
any potential hazard;
    (iii) Is refilled with a material which is not hazardous to such an
extent that any residue remaining in the packaging no longer poses a
hazard; or
    (iv) Contains only the residue of -
     (A) An ORM-D material; or
     (B) A non-flammable gas with no subsidiary hazard at an absolute
pressure less than 276 kPa (40 psia); at 21 degrees C (70 degrees F); and
   (3) Any material contained in the packaging does not meet the defin-
ition in sect. 171.8 of this subchapter for either a hazardous substance
or a hazardous waste.
  (c)  A non-bulk packaging containing only the residue of a hazardous
material covered by Table 2 of sect. 172.504 of this subchapter --
   (1) Does not have to be included in determining the applicability of
the placarding requirements of subpart F of part 172 of this subchapter;
and
   (2) Is not subject to the shipping paper requirements of this subchap-
ter when collected and transported by a contract or private carrier for
reconditioning; remanufacture or reuse.
  (d)  Notwithstanding the stowage requirements in Column 10a of the 
sect. 172.101 Table for transportation by vessel, an empty drum or cy-
linder may be stowed on deck or under deck.
  (e) Specific provisions for describing an empty packaging on a shipping
paper appear in sect. 172.203(e) of this subchapter.
  (f) An empty tank car must conform to the placarding requirements spec-
ified in sect. 172.510(c) of this subchapter.
  (g) A package which contains a residue of an elevated temperature mater-
ial may remain marked in the same manner as when it contained a greater
amount of the material even though it no longer meets the definition in
sect. 171.8 of this subchapter for an elevated temperature material.

Effective Date note: by Amdt 173-227, 56 FR 49989, Oct 2 1991.  sect
173.29 was amended by adding paragraph (g), effective March 30 1992.
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The most important part seems to be sect. 173.29(b).

Transporting fuel on a plane, while legal, is a *lot* of trouble and
not worth it, except when taking an Alaska Bush Plane.  FAA regulations
for that are easier.  Your Alaskan Bush Pilot can give you the details.
I don't have the text for those regulations at hand.

Even though the FAA doesn't prohibit it, the Airlines can refuse to
transport any of this regardless.  It isn't just low-aptitude baggage
checkin staff.  When they made me leave my fuel bottle behind, the
gal called up their hazardous materials phone number first.  I am
grateful that I did not have to leave my MSR stove behind.

If you need a quart of white gas, try talking to the store management
at your arrival city.  They, like grocers, may agree to sell you part of
a can, from a quantity under the counter, at a little higher per-unit cost.

David W Olson, my contribution

Notification at Airports

(so you can't claim you didn't know about the rule)

175.25 NOTIFICATION AT AIR PASSENGER FACILITIES OF 
HAZARDOUS MATERIALS RESTRICTIONS Amend #50 eff 10-1-93

(a)  Each aircraft operator who engages in for-hire 
transportation of passengers shall display 
notices of the requirements applicable to the 
carriage of hazardous materials aboard aircraft, 
and the penalties for failure to comply with 
those requirements. Each notice must be legible, 
and be prominently displayed so that it can be 
seen by passengers in locations where the 
aircraft operator issues tickets, checks 
baggage, and maintains aircraft boarding areas. 

(b)  

(1) Each notice must contain the following 
information:

Federal law forbids the carriage of hazardous 
materials aboard aircraft in your luggage or on 
your person.

A violation can result in penalties of up to 
$25,000 and 5 years imprisonment. (49 U.S.C. 1809)

Hazardous' materials include explosives, compressed 
gases, flammable liquids and solids, oxidizers, 
poisons, corrosives, and radioactive materials.

Examples: Paints, lighter fluid, fireworks, tear 
gases, oxygen bottles, and radiopharmaceuticals.
There are special exceptions for small quantities 
(up to 75 ounces total) of medicinal and toilet 
articles carried in your luggage and certain 
smoking materials carried on your person.

For further information contact your airline 
representative

(2) The information contained in paragraph (a)(1) 
of this section must be printed-

(i) In legible English;
(ii) In lettering of at least 1 cm (0.4 inch) in 
height for the first three paragraphs and 6.0 mm 
(0.2 inch) in height for the last three paragraphs; 
and
(iii) On a background of contrasting color.

(3) Size and color of the notice are optional 
Additional information, if not inconsistent