Question: I am the proud recipient of a brand new, EMV-equipped Visa Debit card through my financial institution -- this card is capable of being used for PIN debit/EFTPOS, signature debit, and ATM transactions, at least in the North American senses of the terms. However, can such a card support EMV chip-and-PIN debit transactions for use overseas in areas where magnetic stripe PIN debit/EFTPOS is no longer supported, or is it limited to chip-and-signature for chip transactions?

Note: [our question about credit cards](https://travel.stackexchange.com/questions/83913) is different because it covers North American EMV *credit* card products -- which do not support PIN debit/EFTPOS or the full panoply of ATM transactions. A Visa signature debit (Check Card) product supports not only signature debit (i.e. credit card like), but PIN debit/EFTPOS and ATM (bank card like) transactions as well. I'm concerned about *all* usage contexts (such as foreign ATMs and automated kiosks that do not have the ability to accept a chip and signature transaction), not just a card-present/manned environment where chip-and-signature fallback is an option, as well.

Answer: 
It is called supply and demand. There is more competition going to Cancun hence lower more competitve airfares. Less competition gping to Flagstaff.
It's basically "whatever the market will bear" with some important exceptions. Fare history for the city pair plays a role and helps predict the future. A carrier new to the route may lower the fare to attract business. Flagstaff has relatively few people, and by laws of chance, there will be far fewer people going PIT-FLG than PIT-CUN.  

Also, it costs a carrier quite a lot to touch down anywhere, so those costs must be spread between only a few passengers.
Finally, Flagstaff is at high altitude, with adverse winter weather. Both factors increase operating costs. With far lower fares, some greeters may consider a quick dash down I-17 to PHX (Phoenix) a good alternative.