However, air observers have been use since the beginning of indirect fire and were quickly joined by air photography.

However, air show accidents are rare and where there is proper supervision air shows have impressive safety records.

However, they are now increasingly of low-floor design and optionally also ' kneel ' air suspension and have electrically or hydraulically extended under-floor ramps to provide level access for wheelchair users and people with baby carriages.

However since the Second World War land or sea battles have come to rely on air support.

However, unless the airflow is adjusted as well, the flame temperature will decrease because an increased amount of gas is now mixed with the same amount of air, starving the flame of oxygen.

However, its use in terrestrial applications is usually limited by its high reactivity with air.

However, it does suffer from nitrogen embrittlement, reacting with nitrogen from air and forming brittle nitrides at the high temperatures necessary to work the metal parts.

However, Empedocles of Acragas ( c. 495-c. 435 BC ) selected four archai for his four roots: air, fire, water and earth.

However, water conducts sound better than air, so the external ear is unneeded: it is a tiny hole in the skin, just behind the eye.

However when combined with land mines, snipers, barbed wire, and air cover, crossfire became a difficult tactic to counter in the early 20th century.

However, in scuba diving, nitrox is normally differentiated and handled differently from air.

However, some flutes, such as the whistle, gemshorn, flageolet, recorder, tin whistle, tonette, fujara, and ocarina have a duct that directs the air onto the edge ( an arrangement that is termed a " fipple ").

However in 1946, when Sir Miles Clifford arrived as governor, there were no air services, no roads outside Stanley and an indifferent sea service.

However, external services continued to be supplied almost exclusively by foreign airlines until Guyana Airways Corporation commenced regional air services in 1979.

However, it tarnishes quickly in moist air, forming a loosely adhering gadolinium ( III ) oxide ( Gd < sub > 2 </ sub > O < sub > 3 </ sub >), which spalls off, exposing more surface to oxidation.

However, it reacts with water and rusts readily, and will also burn in air when heated.

However, the court players may catch and touch the ball in the air within it as long as the player starts their jump outside the zone and releases the ball before they land ( landing inside the perimeter is allowed in this case as long as the ball has been released ).

However if the region of air breakdown extends to another conductor at a different voltage it will create a conductive path between them, and a large current will flow through the air, creating an " electric arc ".

However, when exposed to moist air at room temperature, lanthanum oxide forms a hydrated oxide with a large volume increase.

However, Luftstreitkräfte, or " air armed force ", is also sometimes used as a translation of " air force ".

However, this does not take into the account that Germany's economic situation suffered from limited resources – mainly raw materials like oil and aluminium – which did not provide for much beyond a tactical air force.

However, given the right problem, the use of an appropriate 4GL can be spectacularly successful as was seen with MARK-IV and MAPPER ( see History Section, Santa Fe real-time tracking of their freight cars – the productivity gains were estimated to be 8 times over COBOL ).

However, some locomotive hauled passenger trains may utilize more than one locomotive, as do many locomotive hauled freight trains, and so are able to continue at reduced speed after the failure of one locomotive.

However Masuria was still largely agrarian-oriented and suffered from the economic decline after World War I, additionally badly affected by the creation of the Polish Corridor, which raised freight costs to the traditional markets in Germany.

However, bulk freight still continues to be transported by coastal shipping and by rail transport, and there are attempts to ( re ) introduce public transport as a major transport mode in the larger population centres.

However, the advent of a convenient ( if circuitous ) land route from Montevideo to Buenos Aires via the new bridge reduced freight and passenger traffic through the small port of Colonia on the Río de la Plata just opposite the Argentine capital.

However, most baggage and loose freight items are loaded into containers called Unit Load Devices ( ULDs ), often referred to as " cans ".

However, this caused problems in interchanging freight cars with northern United States railroads, most of which were built to standard gauge or a gauge similar to it.

However, all locomotives built to date, including those for the Stockton and Darlington, had been intended for slow freight, with any passenger service handled by single horse-drawn coaches.

However the main network saw brief surges in use during the First and Second World Wars and still carried a substantial amount of freight until the early 1950s.

However, as Danish law precluded chartered air freight in Denmark ( a policy not rescinded until 1987 ), Maersk instead took over the Falck Air company in 1969, which operated a scheduled service between Copenhagen and Odense.

However, due to the transfer of freight transport from rail to road and the containerization of rail freight transport for economical reasons, hump yards are generally in decline.

However, unlike a local train, the interurban serves a smaller region and has more frequent service, and is oriented to passenger rather than freight service, although some small-load freight service was common, especially in the days before trucks ( lorries ).

However, after the closure of Rugeley A power station and Lea Hall Colliery and reduction in rail freight, it became possible to open up the Rugeley to Walsall line for passenger traffic.

However, over 95 % of freight entering Alaska comes through the Port of Anchorage, which is served by major container ship companies and other carriers.

However, the road has been upgraded to a very high standard in recognition of the heavy freight traffic it carries between the M74 / M6 and the ferry ports for Northern Ireland at Stranraer and Cairnryan, and only two settlements are now not bypassed by it ( at Springholm and Crocketford, both lying around 10 miles west of Dumfries ).

However, during the 1890s the pattern of freight services began to change, ‘ caused by the transport of raw materials and finished products of entirely new industries such as petroleum, cement, brick and tile manufacture, forestry and biscuit making .’ This resulted in the construction of 55 additional freight locomotives of the C2 class

However, one Arn who played a major role in the battle for the Hork-Bajir, Quafijinivon, traveled to Earth on a stolen Yeerk light freight ship and studied and absorbed every human language.

However, a highly important innovation was the so-called " Piggyback Service ", the forerunner of modern intermodal freight transport, which the Great Western introduced in 1936 by moving several hundred truck trailers on specially modified flat cars.

However, in the 1950s, economic shifts ended both the freight and passenger use of the Inner Harbor, such as the Old Bay Line's steamers.

However many companies ( particularly in the freight transport industry ) specify the contractor's schedule, require purchase of vehicles from the company and prohibit work for other companies.

However, the station remained functional as a freight control centre.