Given a travel related situation, and given a specific question about the situation, summarize the question into a title

[EX Q]: In the AAdvantage program, there are 3 statuses, Gold, Platinum and Platinum Executive. The Platinum has a "72-hour upgrade window". The Executive has a 100-hour window. I assume this refers to when you can sign up for an upgrade and essentially get in line for an unsold first class seat.

Do all these seats invariably go to Executive members, or do Platinum members have a chance at them? In other words, what I am thinking is that if there are dozens of Platinum members on a flight in economy and they all sign up for an upgrade, then there might a long list of Executive members in the line for just a handful of first class seats. But if there are not so many Executive members, then maybe Platinum members would have a shot at those seats.

What is the common experience?

[EX A]: Probability of first-class upgrade with only Platinum status?

[EX Q]: I'd like to see the Catacombs of Paris in September 2017. It appears that tickets can be purchased in advance from http://b12-gat.apps.paris.fr/accueil.aspx ...  is the demand such that purchasing tickets in advance is necessary if you want to see it?

[EX A]: catacombs of paris: should tickets be purchased in advance?

[EX Q]: Two days ago I flew with KLM from Calgary to Germany, first with the "Dreamliner" 787 and then with the 737 in economy class. I had the impression (due to my impaired space during eating on the 787) that the seats in the 787 are narrower than in the 737.

Is this true or just my imagination?
With the distance between the seat rows I am not so sure. Maybe reduced too?

[EX A]:
Are the Seats in the Boeing 787 narrower than in the 737 in KLM Airlines?