US Transportation Secretary Pete Buttigieg said Friday there may be some airline delays or cancellations starting July 1st if the last remaining passenger jets haven’t upgraded their altimeters to deal with 5G interference, per a report from The Wall Street Journal report. The Federal Aviation Administration (FAA) maintains that 5G C-band signals could interfere with radio wave emitters passenger jets use to measure how far they are from the ground, which pilots rely on when landing with…