I think it's a good ad
It all depends on the target of the ad.
If you want to simply raise attention, brag a bit and belittle others, then the ad is good.
If you want to sell your product, it seems not that good, because:
US First class seats are about 3% of the total. Their booking status is about (let’s be a little optimistic) 45%. The occupancy is almost 90%, but the difference are Upgrades who don’t pay for that particular product and 40% are on Tripples.
This leaves a little more than 1% of targeted seats by this ad. Hardly worth the doe spent on Jen.
All other customers are somewhat branded second class passengers by the ad, at least I would feel that way. The already loyal EK lovers will have a good laugh watching the ad and continue to book EK, whereas all others will be reinforced in thinking that this company is an arrogant nuisance.
I can’t see any trickle down effect from Jen’s presence, most Friends fans are grown up now. So I leave it to each and every one to judge by what motivation it has been aired and how much commercial effect it will have.