Carriers issued fee waivers ahead of a storm expected to affect travel across New York and Boston, though early disruptions remained limited.
Verizon says it is repairing infrastructure damaged by construction workers after disruption to air travel.
EasyJet says the latest incident "once again calls into question the resilience" of the system, according to the BBC.
NATS, the air navigation service provider for the United Kingdom, faces scrutiny after a technical glitch caused widespread delays and cancellations.
A technical problem at UK air traffic control provider Nats has disrupted departures from several airports, with further delays anticipated, the BBC reported.
Hundreds of flights have been cancelled and more delayed after a glitch hit air traffic control provider Nats, affecting departures from a number of airports, according to the BBC.