[Avodah] ner ish u-beto

[Eli Turkel]

<<What kind of kiyum mitzva can you have if you don't live there?  I
can understand the train situation 150 years ago, when they spent, as
someone wrote, 3 days on the train, so it would be similar to
achsenai. But a plane?>>

There is a major debate among poskim whether one needs a house in
order to light candles. Is the mitzvak on the person (gavra) or the
house (heftza - that each house needs candles). Proofs are brought in
each direction.

As R. Pick indicated R. Elyashiv seems to hold that one who does not
have a home eg an airplane does not light. Other poskim disagree.
Another difference would be soldiers or hikers sleeping outdoors

-- 
Eli Turkel