I'm flying LHR-SYD (BA) and connecting on a separate ticket SYD-AKL. BA16 arrives 6:55AM. Currently on QF3 which departs at 9:45AM.

There is one earlier (8:55AM) which is a possibility, and also, in case of delay a few later on.

Do Qantas offer any sort of same-day change? I'm booked on a flex ticket for what it's worth. As far as I could tell the only difference between Flex and Saver (with regard to changes) is whether you get charged $100AUD for the privilege.

Is this all on one ticket? Do you have checked bags?

More info can also be found here:

Same-day flight change options??

According to my reading, it was on separate tickets:

Just shows how having reading skills really help.

Pay attention to aircraft type. QF put 738s on the TT route as the most common aircraft. QF3 will (or should) be a 789. If seating is important, consider your options.

In Y on the SYD-AKL sector. How much better is Y on a 787 vs a 737?

The physical seat� an inch more legroom on the 787. Width abut the same? But a much better experience in the wide body, like not having cramped aisles and battling your way to the WCs right at the back of the aircraft.

it is just over 2.5 hours journey - I can't remember ever having to go through battles to get to the rear of the aeroplane

If I could get away an hour earlier on a 737, I would do it in economy.

Looking at the fare restrictions, there shouldn't be an issue changing to an earlier flight, though there could be a fare difference to pay if the earlier flight only has availability in a higher booking class

I would suggest that it might be better value to just book a cheaper discount premium economy or business class ticket on QF3 and wait the hour than pay the cost for a flexible economy ticket - or just pay under half the fare for a saver fare and just look at what the cost to change would be on the day. $307 fare + $125 change fee ( if same booking class available ) might be better than $757 up front

My personal preference is a different one. I would wait even longer for a wide body aircraft. I am currently planning the next family vacation and the entire schedule is planned around days of wide body aircraft on specific routes.

There is a full meal service in the main cabin, so carts in the aisle to distribute meals and drinks, then carts in the aisle to collect after the meal.

Carts in the aisle of a narrow body restrict movement for a period of time, with the resulting surge in demand after. This leads to people waiting in the aisle at the back of the plane, shuffling around each other and the crew in the rear galley to get in and out of WCs.

You don�t get those issues in a wide body.

It is only a 2.5 hour flight

Which exacerbates the problem it�s the carts in the aisle for a greater proportion of the total flight time, and with the number of pax trying to use the WCs.

Longer flights mean the carts are proportionally in the aisle less, and people can space out their WC visits.