I would like to do an air excursion at Denali. It seems that the choices are Denali Air(plane) and ERA(copter). We are staying at the Denali Princess and I understand both will pick us up at the Lodge and both have a flight after 4PM. Has anyone done both plane & copter? I would like your opinion of the better choice. Has anyone used ERA &/or Denali Air? I would like to hear your experience with them.