It is possible to use the search function when Planning to find an airway.....but NOT when Navigating.....can this be fixed? Sometimes ATC may ask that you join an airway rather than giving a specific waypoint.....

Also, in the Planning mode, when searching for an airway it highlights the airway in Yellow for about 5 seconds only...is it possible to have it persist?

(iPad user)

Yes, we can enable airway search when navigating, we will try to get this done for the next version.
I'm afraid it's not within the scope of the feature to change the timeout of the highlight that shows the search result on the map.