Not exact matches
Assuming an iron - rich planet with an internal structure like Earth, modelling results for the first discovered super-Earth (GJ 876 d) indicate the existence of a
threshold in planetary diameter above which a super-Earth «most certainly» has a
high water content (an «ocean planet» or «water world,» where thick layers of water and pressurized ice surround a rocky mantle and core); this
threshold was found to be around 24,000 kilometers (or nearly 15,000
miles) in the particular case of GJ 876 d (Valencia et al, 2007).
The card has a relatively
high $ 100 redemption
threshold, requiring you to accumulate 10,000
miles before you can redeem them at their full value.
But while there's no such thing as a «good» devaluation, that devaluation is offset in part by the fact that Delta
miles remain among the easiest to earn, since Gold Medallions and
higher earn 100 % bonus
miles on paid flights and the American Express Delta Platinum and Reserve cards earn 1.4 and 1.5
miles per dollar, respectively, at their annual bonus
thresholds.
Assigning that
higher value to the
miles meant Citi crossed the
threshold for the IRS's mandatory 1099 reporting requirement.
AAdvantage's current offer is to earn up to 2,000 bonus
miles if you hit certain
thresholds in your first 30 days but there can be promos where it's
higher.
Those are the basic requirements, though there are plenty of additional rules about, for example, rolling
miles over from one year to another, as well as
higher spending and flying
thresholds for the
higher tiers of the program, which come with enhanced benefits such as a greater likelihood of upgrades.