Given a travel related situation, and given a specific question about the situation, summarize the question into a title
Example: The green carriage is of course first class. This would be our first preference with our 5 month old baby in lap, because of the presumably larger toilets for changing and whatnot.  However, the baby being a Western white baby... will occasionally babble, screech or cry uncontrollably for a little while.

Speaking in terms of Japanese culture, should we avoid Green class tickets if we are taking aboard a potentially disruptive baby?

Example solution: Japanese train etiquette: Is it acceptable to take a baby in the Shinkansen Green Car?
Example explanation: A person gives a detailed description about a situation where they would prefer to travel on the Shinkansen Green Car but is doubtful if doing that would be against the Japanese train etiquette since they will be traveling with a baby. The question is summarized as Japanese train etiquette: Is it acceptable to take a baby in the Shinkansen Green Car? for easy indexing the next time someone searches for a similar phrase

Problem: I am a US passport holder (living in Canada) traveling from Canada to Ecuador with connections in the US via multiple airlines. I'm worried that some of my layovers might be a bit too tight. To help plan, I'm trying to find out when, where, and how many times I'll have to check luggage and have security checks.

This was all purchased on a single ticket through Cheap O Air.

Here's my itinerary: 

Edmonton, Canada (YEG) -> Las Vegas, USA (LAS) Airline: WestJet
Departure: 8:30 AM, Arrival: 10:30 AM

-Layover time: 1:48-

Las Vegas, USA -> Miami, USA (MIA) Airline: American Airlines
Departure: 12:18 PM, Arrival: 8:07 PM

-Layover time: 1:23-

Miami, USA -> Quito, Ecuador (UIO) Airline: LATAM Airlines
Departure: 9:30PM, Arrival: 12:45Am (next day)

Questions:

Will I have to baggage check for each airline? And does that mean I have to leave the gates for each check and do security each time? If not, where and when can I expect those things to happen?

Also, I did an online chat with a Cheap O Air representative, and the he assured me that I would only need to do baggage check and security at YEG and not at my connections in the US. That sounds too good to be true to be honest and I don't know if I believe him.


Solution: Canada to South America with connections in US with multiple airlines, where will I do security/baggage check?