My husband, 3-year old son, and in-laws are flying to Florida on Friday. My husband is on one PNR, as he has an open-jaw itinerary that includes a business trip the following week. My son & I are on another PNR. The in-laws are on a third PNR.

My husband and I are both gold medallion. Our son currently has no status, nor do the in-laws. The in-laws, the kiddo, and I are all on L/U/T fares. My husband's is Y.

I called Delta today to have my PNR separated. My goal was to have our son's itinerary added to the in-laws itinerary and for my husband & I to increase our chances to sit in F. Regardless of what happens, the MIL will definately end up sitting with the kiddo. Our motivation for wanting to sit in F is all about leg room: my husband is 6-6 and I'm 6-0 (and 6 months pregnant), so the more leg room we have, the better.

I was told they are unable to do this, due to my son's age. I asked about having his PNR added to the in-laws; I was initially told they wouldn't be able to do so. I was later told that it would have been possible, but there aren't any seats available next to the in-laws and the 3-year old can't sit by himself.

Any ideas for separating the PNRs?

Is it possible to upgrade the boy's fare from an L/U/T to a K or higher and then he can be upgraded? (If this happens, the kiddo and the MIL will sit in coach together and the FIL would sit in F with my DH and me).

Other thoughts? Am I SOL?