@stay_frosty, do you have a Boarding Desk on Level 0? It appears so, given that the green line from the Stand by-passes the Level 1 Boarding Desk. If this is the case, it is not a bug.
You need to connect that Desk to your Stand. You’ll end up with both Level 0 and Level 1 Desks connected to the Stand until you can eliminate the Level 0.
Please provide screenshot of your Level 0 with the Stand highlighted.
I’ve had it when moving stands to a new location during remodelling. Even though they were correctly connected it still showed that symbol.
@dallas the issue was present before the second boarding desk. I added the one on floor 0 because I was going to try and get it to work there because the plane was stuck. I should’ve done the screenshot before I added the second desk. it looked identical except for the second green line to the ground floor desk.
this was my second try and saw a similar result on a different save. build floor 0, then floor 1 add escalator. make secure zone. place desk on floor 1. place stand. upgrade jetway. icon hovers over. stand activates for flights, red icon still present plane comes in doesn’t unload. ill try again a third time, I don’t know if the order is an issue. but it happened twice.
reloading the save got rid of the icon, that and making sure there was a secure zone under the jet bridge, I guess that also might have been the issue. when in doubt reload I guess. working fine now.
@Olof Can you please make runway entry/exits upgrade-able to Asphal,Concrete? It will make life so much easier. 
Also needed for public and service roads too 
I always just plan a construction project night for doing this if I’m expanding/upgrading. When the last flight of the day leaves, I dispatch contractors, demolish the existing entry/exit and reconstruct, then save game and re-load to avoid any path finding issues and open the runway back up again.
Not possible if your airport has flights through the night though
What you can do is close your airport. It will cause some reputation am damage due tk flights being delayed etc, but worth it in the long run.
I had this issue and bug-reported yesterday. A save and reload solved the issue.
Multi floor opens a lot of possibilities, especially for segregating departure and arrivals.
I had tried at first to place departure at level 1 and arrival at level 0 with one escalator for each gate to be used by arriving pax. However, this was not satisfactory, as the boarding gate unfortunately does not act as a one way door, so pax would ignore the escalator and keep walking out of the gate.
Now I’ve placed the departure gates on floor 2 and pax boarding need to go down an escalator after passing through the gate to reach the jet bridge in floor 1. Pax arriving from the jet bridge in floor 1 most of the time go straight out a secure exit to reach baggage claim. I’ve had a few dumb pax going up the escalator and walking out the boarding gate just to go down again somewhere else, but it has become rare.
Placing the boarding gate in floor 2 caused this “link” issue with all my medium stands and I though it wasn’t possible to link a gate in floor 2 with a jet bridge in floor 1, but after a save and reload it’s working smoothly.
Hello I’m playing and I noticed that there are some bugs going around the walls
Good evening peeps, Airport CEO Alpha 31.3-1 is currently on its way out to you with the following changes:
Release notes - Airport CEO - Version Alpha 31.3-1
We decided we wanted this version to roll out tonight, so dev blog is being pushed forward until tomorrow afternoon! 
Error codes added to failed bug report sending attempts
Very good 
Nice, thanks!
[ACEO-13972 ] - Structures can be built below terminal overpass
This one is not solved for old saves, only for new built buildings, probably…?
At least my aiport still shows clickable vehicle depots on all flors above 0, through foundation…
Edit:
Just tested, can not rebuild them… 
Why did you take this solution?
I am able to build skybridges over taxiways that planes can underpass, but I’m not able to build a “garage” under a skybridge…?
Edit2:
There is a new bug: after demolishing all floors above, I still can’t build a depot, as it says “can not build under terminal”
ACEO-14038
The game is very beautiful every day! 
The height parallax effect on these structures doesn’t work well with the multiple floor solution which is 2D based. That is why they are not hidden by the terminal floor. Also things like smoke effect render in 3D which also makes it visible through terminal. Aircraft an vehicle are not rendered the same way so that is why it works. It does sound like there is a bug with removing terminal as you state as it should be possible to build them again. Will take a look.
Thanks!
For looking into, and especially for explaining!
Hopefully you can change that height problem, later on…?
It would be really nice to build at least vehicle depots and fuel depots under skybridge, or even in the basement!
With Alpha 31.3-1, my framerate dropped to a blistering 6 FPS. Sometimes, the Management Screen won’t open and the game freezes. This was not a problem with previous version. I’m guessing this is due to the “new and improved” game engine. I have a large airport; savegame is 17 MB zip archive. Somewhat playable, but no longer as enjoyable.
Either revert to the previous game engine, or tweak the new one for performance. Six to eight FPS is unacceptable.
@Olof @Fredrik
I have a little question,
Uhhh, where are stairs in game? We have escalators but not all airports have them, we also need regular stairs
Coming. I cannot remember where but I did read they would be released once things have gotten a little more stable.