So we are flying from the UK to Sydney, via the USA. Turned out, we needed an 'ESTA' just to transfer in the USA (without leaving the airport). We desperately tried to fill one in at checkout but ended up missing our flight! Luckily got given one 24 hours later. Then our flight from the USA has also been rescheduled for 24 hours later (not our fault), so will arrive 48 hours later than planned (if all goes to plan from here). But now panicking as we talked to someone about needing an 'ETA' to get into Australia - do we? We have an 'evisitor651' visa - but do we need an ETA as well? Please help - not sure how much more airport time we can take! Have tried googling but just can't get clear on it. Does anyone know? Is an ETA instead of another visa, or as well?