Interesting article about the effect of the Y2K bug on our miles:

Frequent Flyers: Y2K From A Road Warrior's Point Of
View

Mileage Notebook

May 1, 1999 ... Among the many Y2K worries for travelers is accurate tabulation of frequent flyer accounts. Of course you
always maintain your own accurate records (if you don't, you should), not trusting the accuracy of any program any more than you
would accept your bank's figures on your financial accounts without review. Our projection is that there may be some problems
with smaller airlines that are part of major airline alliances, but the major players are far along the path to year 2000 computer
compliance. Only two majors (American and TWA) have blacked out January 1, 2000 for domestic award travel.

Meanwhile, for those who'd rather place their worry in a less populated area, consider September 9, 1999--the ninth day of the
ninth month of the 99th year--read by computers as 9999. Analytically speaking, your mileage account is in more jeopardy of
disappearing on September 9, since many computers are programmed to terminate on values such as all nines. Make it to
September 10 unscathed and you're likely to be home free (on, perhaps, a frequent flyer award ticket).