Friend going out to Australia two weeks time has asked me the advatage of booking in online. Dont know who they are flying with but the lady concerned has probably included the kitchen sink amongst her baggage.
I know and use the advantage of hand luggage only,but with cases, is it of any benefit. thanks
Having checked baggage or not is unrelated to the benefits of on-line check-in - two different issues. There is a small advantage at the airport where the 'Baggage Drop' queue may be shorter than the 'Check-in' queue.
Aside from that, how airline computers assign seats has always been a mystery to me when I'm jammed three in a row at take off with empty seats either side.
If your friend checks in on-line she may be able to change the seat on-line too but - again - that depends on the airline seating policy. Unless you fly in a premium class or have some imagined loyalty through a frequent flyer programme...