Post here if you are stuck in the game, looking at every item and object was no use, or you straight forward don't know what to do.
For puzzle help I will try to guide you softly and not straight out give you the solution.
Your first 2 objectives (after visiting the office) are to make yourself a caponian disguise and help Debbie with the squirrels and pimp the goldfish bowl.
Was there anything you gained from going to the airport? Any ideas on what you still need to craft that disguise?
Made the mask, received the plant... Even pimped the fish bowl... And then... Stopped. I think I've got to do somethibg with the hairdresser for some reason (that magazine) but otherwise I'm stuck.
You should now have a red crystal, right? Maybe this will show something new on a map...
Btw. you can also ask Debbie when you're stuck, she can help with some of the puzzles.
It sounds like you did everything you are supposed to. If you closed all windows and turned off the lights at the intercom the stewardess should come out of the toilet and go back to her seat. Now you should be able to use the glowing costume.
Do you have a recent savegame so you can try those last steps again?
The Problem is, that she starts to open the windows, as soon as she comes out of the toilet. She is not going straight back to her seat, as you have written.
Well, there is a way to stall her a bit longer. I was assuming this was a bug, but now it dawns on me that you forgot to do something to make unclogging the toilet harder for her...
You need to make sure she doesn't have a toilet plunger when the toilet is clogged. You need to get rid of that toilet plunger for good!