As Gorillaonabike states, extreme conditions can be overcome with well equipped, experienced pros, good planning, etc. However, wind and/or plane noise is NEVER "not an issue", they are ALWAYS an issue, albeit an issue which can (sometimes) be solved without the need for ADR.
So, the information you have been given is definitely incorrect, even more so at the lo/no budget level where highly equipped, high quality audio post pros are commonly not an option. Remember, there are world class professionals, incompetent professionals, large numbers of professionals somewhere between these two extremes and even some who are barely professional at all but like to make out they're experts!
G
