"There was a possible sign of restraint but this new plan makes it clear there is no freeze in construction, " says Melanie Robbins from the organisation.
On Tuesday, Iran offered to start serious talks - as it termed it - over its nuclear program, but there was no sign that it agreed to freeze uranium enrichment.
But there is a danger in too much indiscriminate support: it would freeze the airlines in their present form, with their current capacity, and reduce competition, at a time when the right response is probably to shrink the industry.