This is my first post on here. Seems like a good site with lots of information, so maybe someone could help me.

I have never done this before and want to know if it’s ok and if I will get my miles/segments on OnePass.

I have to deliver a letter.

I’m flying from city ABC-IAH-XYZ. At city XYZ I hand the person the letter and fly back to city ABC via IAH on the same plane I just got off. There is only one flight there that day. It looks like the plane will be on the ground for 25 minutes.

I went to Continental.com and it will let me buy the ticket, but I haven’t bought it yet because I want to know few things first.
1) Will I get my miles?
2) How to I check back in?
3) Do they check me in four all flight at city ABC or do I need to see the agent at the gate in XYZ to get my other boarding pass to come back?

Thanks