Vykkers Labs has docking bays for Blimps, but the only Meetle Baloons we've seen are used by Mudokons. That's not to say Mugs don't have their own version of flight, but I suspect they're more industrial tanks.
EDIT:
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Are you sure Humphrey and Irwin founded Vykker's Labs? I've not heard that stated explicitly anywhere.
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It's in the Oddworld Liscensing Guide, under Vykkers Labs' company profile. The text goes:-
“It all started when two Vykkers with a love for experimentation and a knack for technology set out to make their dreams come true. Neither Humphrey nor Irwin set out to amass great wealth.”
Source:
http://oddworlduniverse.com/togg/ind...N/OTUN0005.jpg
So you're right, it's not explicitly stated, but you can conclude it safely.