After finding a good fare in first from Inv to Mco in april this year. Ive just looked and from 8/1-27/3 ( outbound tue,wed,thur, inbound tue,wed) you can do CW return from Gla to Mco or Mia for £1395 . Also can go via Ord /Mia in First on select days for £1608 on outbound and CW on inbound .It is cheaper from Inv by £200 for the dates I checked in early March.