As a matter of fact, we do have rules for the convenience of differently-abled passengers. However, nothing exempts them from security checks, which results in objectionable things happening. But there are ways of avoiding inconvenience to the differently-abled. For example, a differently-abled person can be made to go through electronic checks and not be compelled to take off his or her prosthetic. In the United States, there is legislation in this regard and both in the UK and the US there are systems and procedures governing the dignity of the differently-abled.
Apart from facing problems at airports, the differently-abled are inconvenienced in other ways also. The 2011 census says there are 21 million differently-abled persons in India and the target is to make 50% of government buildings convenient for them to use in various ways such as having wheelchair lifts, ramps, Braille signposts, etc. Constructing accessible buildings and creating mobile apps for information on inaccessible places can be made part of corporate social responsibility. But all these will remain just dreams if we do not have the right attitude towards the differently-abled and recognise that there must be enough space for them to overcome the hurdles they face.