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In page Frequent-flyer program:

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A status challenge[1] can be an often non-publicized offer to accrue a certain amount of flying within a certain very short timeframe (usually 90 days), to earn elite status. The higher status may or may not be given immediately if it can be seen that qualifying travel (particularly travel that is non-refundable) has already been booked before the challenge was offered, otherwise higher status will be conferred once the challenge is officially completed. In some instances, a fee for a challenge may also be charged.[citation needed] Status challenges are employed by other types of establishments, as well, such as casinos[2][3][4] and hotels.[citation needed]