I had an errant thought yesterday as I watched the Dow fall and not get back up again.

And that thought concerned pensions. And the airlines that still have pension plans for their employees.

Remember that the last time the airline industry had to deal with the “pension issue” was following the market meltdown that followed the “internet bubble” that burst in 2000.

(If you note a bit of sarcasm in that description…good.)

Going into 2001 and 2002, airlines were suddenly looking at pension plans that required more and more in cash infusions — because the value of the underlying securities in the pension funds had declined so precipitously.

Rewind the clock. Start it over again.

We are now looking at exactly the same situation. With equities in a free-fall — all pension funds are gasping for air.

Tuesday, Congress’ top budget analyst estimated that Americans’ retirement plans have lost as much as $2 trillion in the past 15 months. And you can add more to that total, because you can bet his number crunching did not take into consideration the free fall in the market during the last two weeks.

Public and private pension funds and employees’ private retirement savings accounts – like 401(k)’s – have lost some 20% overall since mid-2007, said Peter Orszag, the head of the Congressional Budget Office.

So just a little red flag for the radar screen.

Airlines such as American Airlines and Continental Airlines that have worked hard to keep their employee pension plans in place are going to face tough times ahead — as pension plan funding requirements balloon.

Then again, an airline like United, which was successful in blowing up its employee pension plans as part of their bankruptcy proceedings, won’t have to worry.

Something just doesn’t seem right about all this, does it?