I made the assumption that a large part of Jewish law is based on religion and such should be held to a higher standard. If you agree to the terms then violate them it is a no brainer for me. Remember I am just a simple person.
OK, I see where you are coming from.
Jewish Law includes what I guess we could refer to as civil/commercial law.
The reason this is part of Jewish Law is because there is a religious mandate to ensure that cases are adjudicated appropriately.
Thus, there is a whole section of Jewish Law (commonly referred to as Choshen Mishpat) dealing with commerce, with a strong emphasis on what is binding and what is not binding.
But you do have a point.
The classic case is that if you verbally commit to a business deal, it is non-binding in Jewish Law.
By the same token, there is an expectation, even a mandate, under Jewish Law for one to stick to one's verbal commitments - even though it is non-binding and cannot be enforced in a Jewish court (Beis Din).
So, with regards to the miles situation, I am saying that the airlines terms and conditions might not be considered binding under Jewish Law.
You are suggesting that Jewish Law would consider it appropriate to respect those agreements nonetheless.
And, I could agree with that.