Just as Rome isn’t built in a day, neither are airports. Making 3D buildings is already a long and tedious process, and with larger airports being the centre of attention, it’s only natural that the editors spend the most time, getting as much detail in as possible. Not to mention, the time needed to build these airports can take multiple months, so while the 3D tag may be present in some developer build you’ve seen in the past, it doesn’t tell how far along it is in the production process.
Remember, airport editors are just regular community members who just so happen to be selected to edit. They are volunteers and have busy lives alongside their roles in Infinite Flight.
As for the Finnair A330, that’s something the staff have decided against adding for a multitude of reasons. It may be because there are livery bandwidth limitations, or simply because there are so many liveries, some just don’t make the cut. Nonetheless, if you wish to see the Finnair A330 livery come, leaving a vote in the topics linked below would certainly help the developers gauge where the general interest lies for liveries.