Upon further research, it is the Delta main terminal, so this won't effect the shuttle.

However, it will effect Northwest's operation, because they use the Delta terminal. Which leads to another interesting observation.

According to www.weather.com, the current conditions at MSP are as follows:

Fair, 15F, unlimited visibility

At LGA the conditions are:

Mostly Couldy, 29F, unlimited visibility

Yet NWA.com shows the following status for flight 512:

Departure Arrival
Airport Sched Actual Date Gate Equip Airport Sched Est Actual Date Gate Weather
MSP 1034 1115 -E 22MAR D4 DC9-30 LGA 1411 1434 E 22MAR 8 LGA
DELAYED DUE TO WEATHER CONDITIONS

Anyone wonder what kind of snow NW is shovelling in MSP?