More confused. The last post does not follow the "rules" in the other post about flight numbers. Who is correct . Also , I see similar on site to book ,why won't booking on software work? I see 4 digit flights United operated by ANA --how do you know the difference between those and yours , as referenced in last post . No doubt a travel agent is better I suppose , but will he/she be able to tell difference for sure any better?? Thank you for all your advice .