Hi RNAGG,
Thank you for the comments. We are still finishing the artwork so you will find some aircraft without icons (like the ones you point out). When we do not yet have the correct icon artwork, we substitute the small triangle icon. Also, when we do not have enough information to determinate the aircraft type, we also use the triangle icon. You will also occasionally see an aircraft as a circle icon. We show this icon when we do not have the heading information for the flight.