in/on

Either

Hi Contrex

Many thanks.

Is there any difference in meaning between using 'in' and 'on'? I suppose there isn't. Just to confirm.

Thanks.

Sometimes "in" and "on" are interchangeable, sometimes not. In this situation they are.

We are talking about location.

His telephone number is in [or on] a list of numbers which is stored as digital data in [or on] a memory chip in my mobile phone.

Your name is on [or in, slightly old fashioned] on the list of wedding guests.

At midnight I was in a plane going to Paris.
At midnight I was on a plane going to Paris.

Many thanks, Contrex, for the detailed explanation.