The second airport I checked had chartered the plane on the day of the eruption to two men answering the description of Graber and his pal.
5 seconds sound clip from Radar Men from the Moon - Hills of Death (S1E6).
You can hear this line at 00:05:43.389 in the Blu-ray version of the movie.
Quote context
[...]
- If the moon men did start that eruption, they certainly got results.
- An atomic bomb dropped from a plane would seem to be the only answer.
- You know, Commando Cody thinks that maybe...
- I think we're on the right track.
- Then we're right. They're the ones who bombed the volcano.
- Yes, but that doesn't help us catch them. Couldn't you get a line on them?
- The names and addresses they gave were phony, but I did get one break.
- The airport manager borrowed these matches from Graber and forgot to give them back.
- Al's Cafe. That might do us some good.
- Right.
- If we hear anything Joan, we'll give you a call.
[...]