Originally Posted by
MSPeconomist
Are you sure that the 72 hour rule applies to "up faring" award tickets into FC? I would think that DL would like to take extra miles for flights where FC is lightly booked close to the travel date. There might even be grounds to waive the change fee.
As was said, I think it is highly unlikely that DL would waive the 72 hour rule for purchasing F awards. Do you really think if someone paid 40K miles for a coach award and <72 hours before departure an F award became available for 45K miles (in essence 2,500 more miles one way) that DL would allow rebooking? One of the main reasons for the 72 hour rule is to prohibit this and similar practices of rebooking to lower award levels.
Even if it was truly an "upgrade" from low level coach to low level first, I highly doubt it would be allowed.