Hi

I'm currently booking a trip to USA from the UK, traveling includes:

London>Orlando
Atlanta>LAX
LAX>London

The cheapest price i've found has the middle leg (Atlanta>LAX) going the following route

Orlando>Atlanta>LAX.

Clearly i don't want to have to drive back down to Orlando if i can just board at Atlanta.....My question is can i just board this flight at atlanta (basically i'll never use the Orlando>atlanta fare). I will have checked baggage

If i can get it to work its quite a bit cheaper (not sure why), but this is all fairly new to me so thought i seek some advice beforehand ^

thanks

Andrew