Recently, posted:

I'm sure I've come across posts from people here who seem to fly more
than one type of plane at a time, so I guess it's legal in the US to
be able to do so.

It's not allowed in my country, and was interested in knowing whether
India alone is archaic or do similar rules exist elsewhere too?

In the US, one is certified to fly planes of a particular type, for
example, the basic pilot's certificate may be for Single Engine Land
(SEL). Then, with further training, one can get endorsements for
variations of that type, for example tailwheel, high-power, or complex
aircraft. Flying other types of aircraft, for example multi-engine,
turbine or jet are not permitted without specific training and
certification. Is that as it is in India, or would an airline pilot really
not be permitted to fly a simple Cessna?

Neil