Delta Air Lines deleted its commitment to use 10% sustainable aviation fuel by 2030 and downgraded its net-zero 2050 target from a "goal" to an "aspiration" on its sustainability webpage. The airline cited the high cost of sustainable fuel—which costs two to five times more than conventional jet fuel—and limited supply as reasons for the pullback. This signals deepening cracks in the airline industry's climate commitments amid regulatory pressure and supply constraints that are making longer-term decarbonization targets harder to sustain.