My newest POT SB, cute GND-type, slim blond 19 yr old living less than 5 miles away, just flaked on me.  
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Technically, she flaked 3 times in one promised visit. We started on Saturday talking about a M&G on Tuesday, she agred to meet but didn't confirm the day/time.  Late Monday night she texts me "are we just meeting for coffee?". I say we can spend more time together if we agree we like each other. How about heading to my place after?
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She says sure and asks me how much allowance I'll give her. I tell her my ususal line "in my past arrangements I usually gave her $$-$$$. Is that ok with you?" She asks for the number on the high-end of my offered range, of course. I agree and we set the day/time for the coffee M&G at 7:30 pm Tuesday.  10 Minutes later she texts me back "I forgot I have a class tomorrow night. Can we meet on Wednesday?" I let her know we can and suggest 6 pm. She counters with 7:30 pm and I agree.  
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Today, Wednesday, she texts me at 3 pm and asks to push to 8:30 pm. I say ok, but might as well skip the coffee and meet at my place. She agrees.  At 8:00 pm I ask her if she's ready for the address. She is. I send it and ask her to tell me when she's OTW. 10 mins later, she says she'll be late. I ask how late. She says 9:45 (which by now I'm sure actually means 10:30).  She says she didn't realize she was almost an hour away - she's in a city 20 miles north of what she says is her home location. I tell her it's too late, lets try again tomorrow. She as class until 7 pm tomorow, how about Fri?  
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So I tell her can't Friday m how about afer school tomorrow? No response yet.  
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These are the type of vagueness and poor time/calendar management skills you get with a new SB. It's frustrating and annoying.  And as previoulsy discussed on the board, it appears her actual location is at least 45-30 minutes away from her profile location. This is one of my top five PITA's about POT SB's. But when I finally get some steamy carnal time with her, I'm hoping it will be soooo worth it.  
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If not I have 2 other POT's warming up.  
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Life is still good.

which is why I really treasure those few who truly have the time management skill nailed.  I have 2 of those in my rotation right now.  One I've been dating for 2 years.  She's perfectly reliable.  When we agree to meet, we meet, and she is always on time, has never once in 2 years of fun flaked on me in any way.  The other is a girl I've been dating for a few months now.  She has her life organized like a science; ie, she'll ask me if I can meet her at such and such a date and time 2 weeks in the future.  When I say yes, I don't even bother confirming with her until showtime because she always shows up, right on time.  And both of these women are just 20 years old and were teens when I began dating them.

END OF MESSAGE

Possible, but I think it's more newbie behavior. She didn't push back at all on the allowance amount I offered, even though it was about 30% under market for 19 year old hottie. From the context of her messages I think she's one of those people who just don't think beyond the immediate time horizon.  
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If she's thinking "yeah, I'll go meet my new SD tonight", she never makes the effort to think through the time math:  Meet time, less travel time, less get ready time, equals start time. She just ends up leaving class and looking at her phone (I was going to say watch, but... yeah) and goes "oh shit, I'm late".  As with most young people this behavior will not likely improve until she suffers some severe consequences, like losing a job (or a SD) for consistently being late.  
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At least she texted me when she realized it. That's why I'm still willing to reschedule. If she'd waited until she was an hour late to tell me (it's happened to me before), I would just ice her and move on.  
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As I think about it, I wonder if this is not entirely her fault.  If we compare the idea of being punctual, the importance for an older generation was greater than it might be for millennials.  In my youth, being late meant missing a movie, missing a family dinner, missing a wedding or funeral, missing a doctor appointment, losing a job, not getting to a store before closing, missing a class, etc.  Today, movies are on-demand, showing up for a party that started at 7:30 before 11:00 pm is simply not done, families don't eat together, jobs are virtual and time flexible, stores/restaurants are open late, etc. As we move to a virtual social landscape and a consumption on-demand market, perhaps the critical NEED to always be on time has diminished for many aspects (but not all) of our lives.  

Had almost the identical scenario last month, same age, same number of postponements.
However I think Mr. F might be correct.
 In my case, after having text blocked her, she sheepishly contacts me several weeks later through the website and begs forgiveness.
Later, she admits being involved with another SA guy, but that she wants to make it up to me.
She proposes a next day meeting, which I decline and instead set up a M&G for the weekend.
Earlier the next day one of my SB cancels on me so I text the 19 yo and propose we meet like she had asked.
Crickets the whole day, but the following day she apologizes and said it was her Father's birthday and they  had big party for him - surprisingly something she seemingly forgot a day or so earlier!
I write it off to dealing with immature 19 yo, and tell myself to once again set my search functions for 21+.
One thing you mentioned caught my eye: these younger girls may agree to come to your place first to get a drink or so, or as a followup, but inevitably they get cold feet and bail.  I found it best not deviate from the classical M&G and then let the chips fall where they will no matter how eager they appear to be.

She just texted me to confirm tonight.  
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Life is still good.

Short version is I got laid last night.  

Longer, and perhaps more interesting version is:
- She texted me at 7:30: hey just so you know my hair is a lot shorter now. don't want you to think I'm cat fishing you. I reply and say ok, are you on your way? No, not yet.
- At 8:00 pm she texs me: 35 mins away. I reply ok
- At 8:27 pm: I made a wrong turn, got lost. Reply:  Ok need help or directions?
- At 8:40: still 20 mins away. Reply ok
- At 9:15 pm: calls me: I got pulled over for speeding, still want me to come?  reply, ok
- At 9:30 pm: text - I think I'm here. Can you come outside.  

That's a RED FLAG! All my doubts about her combine (no meet & greet, multiple flakes and delays) and I imagine myself heading out into the street only to be forced into a van at gunpoint and robbed or worse. I am not going outside.  

I look out my door (I have a locked heavy metal screen door) and don't see her or any unknown vehicle. I call her and ask what house number she is at. She says she's walking and then I see her in the street - alone. I call out to her and she comes inside. I lock the screen and wooden door behind her and off we go...  

The rest of the night played out as any generic BCD with a hot, 19 year old GND blonde who loves to DT and moan for "Daddy" to fuck her harder might.  You've all been there/done that, right?  

Anyway as she's wiping off her chin, tits, stomach, etc. she looks at me and says "That was fun! can I come back?"  

What would your answer be?

You sure it was the same girl?
My all time fantasy: some random girl I set up a BCD comes walking by and we have a 3 hr fuck-feast, only to find out it was someone else!

It was the same girl. Her hair was indeed shorter, it was just past her shoulders rather than below her waist in the profile pics. But face was the same and, as her profile indicated she's 5'7".  That's pretty tall it's probably difficult to swap some "random" girl in (which really would be catfishing, I suppose) at that height.  If she was, say 5'2" and another girl showed up that was 5'3" I admit I probably would not notice. But I'm 6'1" and I know what a 5'7" girl looks like standing next to me.  
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Plus, the feared "guy with a gun in the suspicious van" thing I feared did not appear. So I'm going to call this a win for the Cat.  
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Meeting an 18 year old local brunette tomorrow for late lunch. Not sure she's ready for BCD yet as she's a newb and might just be testing the waters. She hasn't provided me her cell or used my cell to text me, so I'll put her at a 50% no show risk. But she suggested a good spot to meet, so at the least, I'll get a tasty lunch.