DETAILS ON CUSTOM AIR OPTION

Here are the basic guidelines.

For a non-refundable custom air fee of $100 per person you can request to customize your air itinerary
Choice of carrier is limited to those with whom Radisson has current contracts. Not all airlines are available.
You may leave early or stay over in the embarkation and debarkation cities.
Once itinerary is arranged you have 24 hours to approve the arrangements
After 24 hours any further changes will be an additional $100 per person custom air fee

Advantages are earlier arrangements often mean better connections, early seat assignments and possibly the carrier of you choice for FF miles.

Custom air will be facilitated through your TA

Hope that helps.